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7/27/2019 Domestic Ventilation Compliance Guide 2010
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Domestic VentilationCompliance Guide
2010 Edition
7/27/2019 Domestic Ventilation Compliance Guide 2010
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April 2010Department for Communities and Local Government
Domestic Ventilation Compliance Guide2010 Edition
7/27/2019 Domestic Ventilation Compliance Guide 2010
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Published by NBS, part of RIBA Enterprises Ltd, and available from:
RIBA Bookshops Mail Order15 Bonhill StreetLondon EC2P 2EA
Telephone orders/General enquiries: 020 7256 7222Fax orders: 020 7374 2737Email orders: [email protected]
Or order online at: www.thenbs.com/buildingregs
RIBA BookshopsRIBA, 66 Portland Place, London W1B 1AD. Telephone 020 7256 7222Birmingham & Midland Institute, Margaret Street, Birmingham B3 3SP. Telephone 0121 233 2321RSUA, 2 Mount Charles, Belfast BT7 1NZ. Telephone 02890 323 760
CUBE, 113-115 Portland Street, Manchester M1 6DW. Telephone 0161 236 7691milkandsugar, 82 Wood Street, Liverpool L1 4DQ. Telephone 0151 707 4380
ISBN 978 1 85946 378 9Stock code:72349
Crown Copyright, 2010
Copyright in the typographical arrangement rests with the Crown
This publication, excluding logos, may be reproduced free of charge in any format or medium for research, private studyor for internal circulation within an organisation. This is subject to it being reproduced accurately and not used in amisleading context. The material must be acknowledged as Crown copyright and the title of the publication specified.
Any other use of the contents of this publication would require a copyright licence. Please apply for a Click-Use Licencefor core material at www.opsi.gov.uk/click-use/system/online/pLogin.asp, or by writing to the Office of Public Sector
Information, Information Policy Team, Kew, Richmond, Surrey TW9 4DU
e-mail: [email protected]
If you require this publication in an alternative format please email [email protected]
Communities and Local Government Publications
Tel: 030 0123 1124Fax: 030 0123 1125
Email: [email protected] via the Communities and Local Government website: www.communities.gov.uk
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Contents | 3
Contents
Section 1 Introduction 5 1.1 Status of guide 5
1.2 Requirements on air flow testing, commissioning andinformation provision 6
1.3 How to use this guide 7
1.4 Key terms 8
Section 2 Natural ventilation and intermittent extract systems 9
2.1 System 1 Background ventilators and intermittent extract fans 9
2.2 System 2 Passive stack ventilation 9
Section 3 Continuous mechanical ventilation systems 24
3.1 System 3 Continuous mechanical extract: centralised andde-centralised 24
3.2 System 4 Continuous mechanical balanced systems with heatrecovery: centralised and single room 24
Section 4 System completion and handover 53
4.1 Documentation to be handed over to the end user 53
Section 5 Inspection checklist and air flow measurement test sheet 55
5.1 Checking design against measured air flow rates 55
5.2 Instrument calibration 56
5.3 Demonstrating compliance 56
Part 1 System details and declarations 57
Part 2a Installation details 58
Part 2b Inspection of installation 59 Part 3 Air flow measurement test and commissioning details 61
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Section 1 Introduction | 5
Section 1
Introduction
This guide provides detailed guidance to help persons comply with requirements in
building regulations for installation, inspection, testing, commissioning and provision of
information when installing fixed ventilation systems in new and existing dwellings. The
aim is to ensure the provision of adequate ventilation while minimising energy use and
environmental problems such as noise and thermal discomfort.
It is important to note that the guide covers a range of frequently occurring
situations but it is not exhaustive and alternative means of achieving compliance
with the ventilation requirements in the Building Regulations may be possible.
1.1 Status of guide
Building regulations contain functional requirements, such as requirements that buildings
must be structurally stable, must be constructed and fitted out to ensure reasonable levels
of fire protection, and must be reasonably energy efficient. These functional requirements
are often drafted in broad terms, and so it may not always be immediately clear to a person
carrying out building work how to comply with the relevant requirements. Consequently
documents are often issued by the government department responsible for building
regulations which provide practical guidance on ways of complying with specific aspects
of building regulations in some of the more common building situations. In England and
Wales, these documents are called Approved Documents.
Approved Documents are intended to provide practical guidance but they are not intended
to be comprehensive. Consequently there may be references in Approved Documents to
other documents which will provide more detailed information and assistance on parts ofthe guidance. This guide is one of those documents. It provides additional detail in relation
to the guidance about compliance with the requirements for installation, inspection,
testing, commissioning and provision of information in Approved Documents F, L1A and
L1B which apply when installing fixed ventilation systems in new and existing dwellings.
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It is important to note that following the guidance in an Approved Document or any
guidance referred to by that document does not guarantee compliance with building
regulations. If you follow relevant guidance in an Approved Document and in any
document referred to which provides additional advice or information to help you followthat guidance (such as this guide), there is a legal presumption that you have complied with
building regulations. However, in every case it is for the building control body, whether a
private sector approved inspector or the local authority, to decide whether work complies
with building regulations. So, you should always check with the building control body
before you start work what they consider it is necessary for you to do to comply with
building regulations.
1.2 Requirements on air flow testing, commissioning andinformation provision
In England and Wales, requirements for ventilation and energy efficiency are contained in
Part F, Ventilation, and Part L, Conservation of fuel and power, of Schedule 1 to the Building
Regulations. This guide provides appropriate guidance for the four types of ventilation
system discussed in detail in Approved Document F. It is referenced by Approved Document
F (ADF), Approved Document L1A (ADL1A), and Approved Document L1B (ADL1B) as
providing guidance on meeting those requirements for ventilation systems.
Specific statutory requirements in the Building Regulations for England and Wales which
this guide addresses are:
The requirement to commission mechanical ventilation systems (where they
can be tested and adjusted) in accordance with an approved procedure, and
to provide a notice confirming that commissioning has been carried out to the
building control body not later than five days after the work has been completed
where a person has had to submit a building notice or full plans or, in other cases,
not later than 30 days after the completion of work.
For mechanical ventilation systems in new dwellings only, the requirement
to measure air flow rates in accordance with an approved procedure, and to
provide a notice recording the results and the data on which they are based in an
approved manner to the building control body not later than five days after the
final test is carried out.
The requirement to provide sufficient information about the ventilation system
and its maintenance requirements to owners or occupiers so that the ventilation
system can be operated to provide adequate air flow. This guide contains
recommendations on the range of information that could be given to dwelling
owners on completion to satisfy this requirement.
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Section 1 Introduction | 7
The approved procedures for commissioning mechanical ventilation systems in
dwellings and air flow testing of such systems in new dwellings are set out in
Tables 2, 6 and 8 according to which ventilation system has been adopted.
The manner in which the results of air flow testing and the data on which they
are based are to be recorded and given to the building control body is given in
Part 3 of Section 5 of this document. A downloadable copy of this form is available at
www.planningportal.gov.uk/approveddocuments >Part F (Ventilation)>Associated
documents, for the use of those carrying out the air flow testing.
In addition to specifying how the above statutory requirements in the Building Regulations
should be met, this guide also contains recommendations for an inspection checklist and
for recording the equivalent area of background ventilators.
The inspection checklist and air flow measurement test and commissioning sheet in
Section 5 should be completed by installers and test and commissioning engineers,
and should form part of the information pack given to dwelling owners to satisfy the
information requirement.
1.3 How to use this guide
The guide refers to Systems 1 to 4 as specified in Approved Document F.
Section 2provides guidance on installation, inspection and testing of natural ventilation
and intermittent extract systems; andSection 3provides guidance on installation,
inspection, testing and commissioning of continuous mechanical ventilation systems.
The testing and commissioning procedures set out in this guide are the approved methods
by which a system must be checked and assessed before handover to the end user. For
mechanical ventilation (both intermittent and continuous), air flow measurement tests
are included as part of the commissioning process. For natural ventilation openings, the
recommendation is to carry out a visual inspection and record theequivalent area.
Supplementary information appears in some places in the guide initalic font with a grey
background. It is intended to assist understanding of the guidance or to direct readers
to sources of additional information, but is not part of the guidance. In some cases
there are links to best practice guidance that goes beyond the recommended minimum
requirements.
BS EN 14134: 2004Ventilation for buildings Performance testing and installation checks
of residential ventilationsystemsmay be referred to for further guidance on installation,inspection, testing and commissioning procedures.
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Section 4details the information that it is recommended should be left with the building
owner on completion of the installation of the system. This information is to aid the user to
correctly operate and maintain the system.
Section 5contains in Part 1 a form for recording details of the installation; in Part 2a
an installation checklist; in Part 2b a form for recording the results of a visual inspection
of the installation; and in Part 3 the air flow measurement test and commissioning
sheet to be given to the building control body.
1.4 Key terms
The following key terms where used in this guide are shown inbold italicfont. For other
terms, reference should be made to Approved Document F.
Background ventilatoris a small ventilation opening designed to provide controllable
whole building ventilation.
BCB or building control bodyis a local authority or an approved inspector.
Continuous mechanical extract ventilation (MEV)is a ventilation system comprising
a central ducted continuously running extract fan (or a set of local continuously running
extract fans in the wet rooms for de-centralised systems), air being supplied via background
ventilators into the habitable rooms.
Continuous mechanical balanced ventilation with heat recovery (MVHR)is a
ventilation system that comprises central ducted supply and extract fans, air being supplied
into the habitable rooms via a heat recovery unit.
Equivalent areais a measure of the aerodynamic performance of a ventilator. It is the area
of a sharp-edged circular orifice which air would pass through at the same volume flow
rate, under an identical applied pressure difference, as the opening under consideration.
Free areais the geometric open area of a ventilator or terminal.
Intermittent extract fanis a mechanical ventilator that does not run all the time, usually
only running when there is a particular need to remove pollutants or water vapour (e.g.
during cooking or bathing). Intermittent operation may be under either manual control or
automatic control.
Passive stack ventilation (PSV)is a ventilation system using ducts from terminals in the
ceilings of rooms to terminals on the roof that extract air to outside by a combination of the
natural stack effect and the pressure effects of wind passing over the roof of the building.
Single room heat recovery ventilator (SRHRV)is a ventilation system comprising localcontinuously running balanced supply and extract fans in a single room.
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Section 2 Natural ventilation and intermittent extract systems | 9
Section 2
Natural ventilation and intermittentextract systems
2.1 System 1 Background ventilators and intermittentextract fans
The information provided in Tables 1 and 2 gives guidance on good installation practiceand on procedures for the inspection and air flow measurement testing of systems
comprisingbackground ventilatorsand intermittent extract fans(including cooker
hoods) for dwellings. The relevant design guidance is given in ADF, in particular Table 5.2a.
2.2 System 2 Passive stack ventilation
The information provided in Tables 3 and 4 gives guidance on good installation practice
and the procedures for the inspection of passive stack systems for dwellings. The relevant
design guidance is given in ADF, in particular Table 5.2b.
Note:
If intermittent extract fans are installed in dwellings where the ventilation system
follows System 2, air flow measurement testing should be carried out and recorded as
for System 1.
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Table1:System1installationguidelines
Installationclause
s
Supplementaryinformation
1.0Intermittent
extract
fans
(including
cooker
hoods)
Manufacturersde
tailsandspecificinstruction
s
a.
Theinformation
providedinthisTablesetsouttheminimumrecommended
proceduresforty
picalSystem1installations.
b.
Forfurtherprodu
ct-specificinformation,refertothemanufacturers
installationinstru
ctions.
Preparation
a.
Ensurethefinallocationofequipmentofferssufficientspacetoallowaccess
formaintenance
.
b.
Forthrough-wallunits,coreaholeofasuitabledimensionthroughthe
fabricofthebuildingfortheinstallationofthed
uct.T
heholeshouldhavea
slightdownward
angletowardstheoutsidetop
reventwateringress.
c.Forceilingmoun
tedfans/terminals,t
heholessh
ouldbecuttotheminimum
requiredsizesuchthatthefan/grillespigotfitssnuglyintothehole.
d.
Whereductwork
penetratesabuildingsairbarrier,thecontinuityofthe
barriermustbem
aintained.T
henatureofthebarrierandeaseofachieving
aneffectivesealshouldbeconsideredbeforeho
lesaredrilled.
e.
Itisimportantto
considertheplanningandinstallationofductworkinco-
ordinationwitho
thertradeactivitiesandinstallations,suchthatroutesare
designedwithou
tcompromisetotherequiredv
entilationairflowrates.
Installationthroughwall
a.
Theductsleevec
onnectingthefanoutlettothe
terminal/grilleshouldbeat
leastthesamediameterasthefanoutlet.
b.
Theductsleeves
houldberigid.Insituationswh
erethisisnotpossible,
flexibleductworkmaybeused,providingextrac
tventilationratesarenot
compromised.Flexibleductworkshouldbepulledtaut.
c.Theinstalledduc
tsleeveshouldbesealedtothe
externalandinternalwallto
maintainairtightness.T
hisisofparticularimportanceforcavitywalls.
d.
Ensurethatthere
arenoobstructionsintheductpriortofittingthefan.
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Section 2 Natural ventilation and intermittent extract systems | 11
Table1:System1installationguidelines(continued)
Installationclause
s
Supplementaryinformation
1.0Intermittent
extract
fans
(including
cooker
hoods)
(continued)
Installationthroughwindow
a.
Checkthesuitab
ilityofthewindowandobtainasuitablewindowmounting
kitfromtheman
ufacturerfortheproposedfan
unit.
Forwindowmountedfans,do
not
plantoinstallinopeninglights.T
he
minimumadvisableglassthicknessis
4mm,butseekspecialistadvicefrom
glazierformountingsuitability.
Installationducted
a.
Rigidducts,recta
ngularorcircular,shouldbeusedwhereverpossible.W
here
necessary,flexibleductsmaybeused,buttheirlengthsshouldbekepttoa
minimum,conne
ctingtorigidductworkatthee
arliestopportunity.
b.
Forflexibleductconnectedtoaxialfanstheleng
thislimitedto1.5metres;
forcentrifugalfa
nsthelengthlimitis6metres(forextractrates6to30l/s),
and3metres(forextractrates31to60l/s).
c.Thenumberofb
endsislimitedtotwoforupto
30l/s,andreducestoone
bendforhigherextractrates.
d.
Flexibleductshouldbepulledtaughttoensurethatthefullinternal
diameterisobtainedandflowresistanceminimised.T
hisisconsideredto
havebeenachievediftheductisextendedto90
%o
fitsmaximumlength.
e.
Ductingshouldb
einsulatedwhereitpassesthroughunheatedareasand
voids(e.g.loftsp
aces)withtheequivalentofatleast25mmofamaterial
havingathermalconductivityof0.0
4W/(m.K
)toreducethepossibilityof
condensationforming.
f.Horizontalducting,includingductinginwalls,shouldbearrangedtoslope
slightlydownwardsawayfromthefantopreventbackflowofanymoisture
intotheproduct.
g.
Verticalductingwill
requireacondensatetrapin
ordertoprevent
backflowofanymoistureintotheproduct.Follo
wthemanufacturers
recommendationsintheseinstances.
h.
Whereductingp
assesthroughafire-stoppingw
allorfirecompartment,
therequiredmea
surestoensurecompliancewithPartBoftheBuilding
Regulationsshou
ldbetaken.
Exceptionstoductlimitswillbe
acceptedprovidingevidencefrom
themanufacturerisavailable
thatconfirmsthatthespecified
performancewilln
otbeaffected.
Forin-linefans,referto
manufacturersdata.
Forductinstallations,seeDiagram1.
Wherepossible,connectstraig
ht
lengthsofductworktofanspigot.
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Table1:System1installationguidelines(continued)
Installationclause
s
Supplementaryinformation
Cookerhoods
a.
Cookerhoodssh
ouldbeinstalledsothataccess
iseasyforchangingand
cleaningofthefi
lter/filters.
Re-circulatingcookerhoodsdo
not
provideextractventilation.Toprovide
extractventilationinakitchenfor
thepurposesofPartF,anextractfan
tooutsideshouldhaveaninsta
lled
capacityofatleast60l/s.
2.0Ventilation
airinletsand
discharge
terminals/
grilles
Backgroundventilators
a.
Backgroundventilatorsshouldbeprovidedtom
eettheminimumrequired
equivalentareao
fventilationspecifiedbyTable
5.2aofADF.
b.
Forwallmountedbackgroundventilatorsmake
anopeninginthewall
inaccordancewiththemanufacturersinstructionsforthesizerequired.
Ensurethatthere
arenoobstructionsintheopening.
c.Installthewallor
windowventilatorproductinaccordancewiththe
manufacturersinstructions.
d.
Ensurethatwallorwindowventilatorproductsaresealedtotheirsurrounds
usingaproprieta
rysealantasrecommendedby
themanufacturer.
Backgroundventilatorsfittedin
windowsareusuallyinstalledd
uring
manufacture.C
loseco-ordination
betweensupplierandinstalleris
recommendedtoensurecorrect
locationofventilators.
Backgroundventilatorsinstalle
din
wallsmayrequireaproprietary
wind
cowltoreducewindnoiseand
prevent
over-ventilation.
Dischargetermina
ls/grillesroofandwallmo
unted
a.
Onlyproprietary
terminalsshouldbeused.
b.
Ensurethatthefreeareaoftheterminal/grilleopeningisaminimumof
90percentofthefreeareaoftheductingbeing
used.
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Section 2 Natural ventilation and intermittent extract systems | 13
Table1:System1installationguidelines(continued)
Installationclause
s
Supplementaryinformation
3.0Miscellaneous
Airtransfer
a.
Toensuregoodtransferofairthroughoutthedwelling,t
hereshouldbean
undercutofminimumarea7600mm
2in
allinternaldoorsabovethefloor
finish.T
hisisequ
ivalenttoanundercutof10mmforastandard760mm
widthdoor.
b.
Ensurethatthea
irtransferprovisionisunrestrictedafterfloorfinisheshave
beenlaid(e.g.ca
rpetsshouldnotencroach).Thisshouldbeachievedby
makinganundercutof10mmabovethefloorfi
nishifthefloorfinishis
fitted,orbya20
mmundercutabovethefloorb
oards,orothersurface,i
f
thefinishhasnotbeenfitted.
4.0Controls
General
a.
RefertoTable5.2aofADF.
b.
Ensurethatalocalmanualoverridecontrolisprovidedforanyextractfan
operatedbyauto
maticcontrols.
Humiditycontrolsshouldnotb
eused
forsanitaryaccommodationw
here
odouristhemainpollutant.
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Diagram 1: Duct installations
Airflow
Airflow
Room terminal/extract grille
CavitySealant
Discharge grill
Grille
discharge
opening
Maximum length of
flexible ducting
Flexible
ducting supports
-
-
Minimum radius =
the diameter of
flexible ducting used
Sleeve
Do
Dont
Preferred flexible
ducting route
Restrictions
Peaks and troughs
b
a
The inner radius of any bend should be greater or equal to the diameter of the ducting
being used. If the radius is reduced, the resistance of the bend will increase and the volume
of air being extracted will decrease (see Do diagram above).
Ensure flexible ducting is installed without peaks or troughs (see Dont diagram above).
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Section 2 Natural ventilation and intermittent extract systems | 15
Table2:System1inspectionandtesting
Recommendationsandminimumrequirements
Supplementaryinformation
1.0Intermittent
extract
fans
(including
cooker
hoods)
Visualinspections
CarryoutthefollowingchecksandrecordtheresultsinSection5:
a.
Doesthesystem
installationcomplywiththeins
tallationclausesinTable1?
b.
Doesthenumbe
rofextractpointsandterminalssatisfyTable5.2ainADF?
c.Isallequipmentingoodconditionwithnoobviousdefectsthatwill
be
hazardousoraffectthesystemperformance?
Functionalchecks
a.
Temporaryprote
ctionandpackagingshouldbe
removedfromallproducts.
b.
Checkfanoperatescorrectlywhenactivatedby
manualcontrol(e.g.l
ight
switch),orautom
aticcontrol(e.g.P
IR).
c.Ensurefanswitchesoffaftercontrolsarede-activatedand,inthecaseof
run-ontimers,th
atthesearesettoaminimumof15minutes.
Unlessthetimercontrolisgrad
uated
inminutes,run-ontimersshou
ldbe
checkedagainstatimedtestand
adjustedifruntimeislessthan
15
minutes.
Airflowmeasurem
enttesting
a.
Ensurethatallintendedbackgroundventilators
orotherairtransferdevices
areopen.
b.
Ensureallinterna
landexternaldoorsandwindowsareclosed,including
roomsinwhichm
easurementsarebeingcarried
out.
c.Airflowmeasure
mentsshouldbeperformedusingacalibratedairflow
devicewithprop
rietaryhoodattachmentandre
sultsrecordedinlitresper
second(l/s).Refe
renceshouldbemadetoTable
5.1aofADFfordesignair
flowrates.
d.
Recordtheextractairflowforeachextractfano
ntothecommissioning
sheet(seeSection5).
e.
Theinstruments
houldbecalibratedannuallyan
dbecapableofachieving
anaccuracyof
5percent.
Note:Thisistheapproved
procedureformeasuringth
eair
flowofintermittentextractfans
andcookerhoodsasrequiredby
theBuildingRegulations.
Themostcommonmethodisthe
useofavaneanemometer,orsimilar,
placedinahoodwhichcoversthe
terminalto
measuretheextractair
flowrate.
Calibrationofmeasurement
equipmentshouldbeundertaken
annuallybyreturningtheinstrument
toaUKASaccreditedcalibratio
n
centre.
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Table2:System1inspectionandtesting(continued)
2.0Background
ventilators
Visualinspections
CarryoutthefollowingchecksandrecordtheresultsinSection5:
a.
DoestheequivalentareaandlocationofairinletssatisfyTable5.2ainADF?
b.
Hastemporaryprotectionandpackagingbeenremovedfromall
backgroundventilators,anddotheshuttersopenandclosecorrectly?
c.Isthereanadequ
atesealbetweentheventilatorproductandthewall/
windowframe?
Theequivalentareashouldbe
displayedontheairinletprodu
ct.
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Section 2 Natural ventilation and intermittent extract systems | 17
Table3:System2installationguidelines
Installationclause
s
Supplementaryinformation
1.0Ductwo
rk
prepara
tion
and
installa
tion
Manufacturersde
tailsandspecificinstruction
s
a.
Theinformation
providedinthisTablesetsouttheminimumrecommended
proceduresforty
picalSystem2installations.
b.
Forfurtherprodu
ct-specificinformation,refertothemanufacturers
installationinstru
ctions.
c.Internalductdiametersand/orcrosssectionalareasshouldbenolessthan
thesizesgivenin
ADF,Table5.2
b.
Preparation
a.
Ductingroutesandoffsetsshouldbeplannedsuchthattheirfinal
installationisina
ccordancewiththeillustratedguidancegiveninDiagrams
2and3.
b.
Separateductsshouldbetakenfromtheceiling
softhekitchen,bathroom,
utilityroomorW
Ctoseparateterminalsontheroof.Donotusecommon
outletterminalsorbranchedducts.
c.Whereductwork
penetratesabuildingsairbarrier,thecontinuityofthe
barriermustbem
aintained.T
henatureofthebarrierandeaseofachieving
aneffectivesealshouldbeconsideredbeforeho
lesaredrilled.
d.
Itisimportantto
considertheplanningandinstallationofductworkinco-
ordinationwitho
thertradeactivitiesandinstallations,suchthatroutesare
designedwithou
tcompromisetotherequiredv
entilationairflowrates.
Ideally,a
llductsshouldbeinsta
lledas
nearverticala
ssiteconstraintsallow.
Bothrigidductingandflexibleducting
aresuitableforPSVsystemsandhave
similarresistancetoairflowattypical
PSVsystemairflowrates.
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Table3:System2installationguidelines(continued)
Installationclause
s
Supplementaryinformation
1.0Ductwo
rk
prepara
tion
and
installa
tion
(continued)
Installation
a.
Carefullymeasurethelengthofducttobeused
suchthatitisjustsufficient
tofitbetweenth
eceilingterminalandtheoutle
tterminal.Flexibleducting
shouldbefullyextendedbutnottaut,allowingapproximately300mmextra
tomakesmooth
bendsinanoffsetsystem.
b.
Ductingshouldb
eproperlysupportedalongits
lengthtoensurethatthe
ductcanrunstra
ightwithoutdistortionorsaggingandthatthereare
nokinksatanyb
endsortheconnectionstoceilingterminalsandoutlet
terminals.F
lexibleductinggenerallyrequiresmo
resupportthanrigid
ducting.
c.Intheroofspace
theductshouldbesecuredtoawoodenstrutthatis
securelyfixedatbothends.Aflexibleductshouldbeallowedtocurvegently
ateachendofth
estruttoattachtotheceilingterminalandroofoutlet
terminal.
d.
Arigidductshou
ldbeusedforsystemstabilityforthepartofaPSVsystem
whichisoutside,
abovetheroofslope.I
tshould
projectdownintotheroof
spacefarenoughtoallowfirmsupport.
e.
Ensurethatthed
uctissecurelyfixedtotheroof
outletterminalsothatit
cannotsagorbe
comedetached.
f.Ductingshouldb
einsulatedwhereitpassesthroughunheatedareasand
voids(e.g.loftsp
aces)withtheequivalentofatleast25mmofamaterial
havingathermalconductivityof0.0
4W/(m.K
)toreducethepossibilityof
condensationforming.
g.
Whereaductextendsexternallyaboveroofleve
lthesectionabovetheroof
shouldbeinsulatedoracondensatetrapshould
befittedjustbelowroof
level.
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Section 2 Natural ventilation and intermittent extract systems | 19
Table3:System2installationguidelines(continued)
2.0Ventilation
airinletsand
discharge
terminals
Backgroundventilators
a.
Backgroundventilatorsshouldbeprovidedtom
eettheminimumrequired
equivalentareao
fventilationspecifiedbyTable
5.2
bofADF.
b.
Forwallmountedbackgroundventilatorsmake
anopeninginthewall
inaccordancewiththemanufacturersinstructionsforthesizerequired.
Ensurethatthere
arenoobstructionsintheopening.
c.Installthewallor
windowventilatorproductinaccordancewiththe
manufacturersinstructions.
d.
Ensurethatwallorwindowventilatorproductsaresealedtotheirsurrounds
usingaproprieta
rysealantasrecommendedby
themanufacturer.
Backgroundventilatorsfittedin
windowsareusuallyinstalledd
uring
manufacture.C
loseco-ordination
betweensupplierandinstalleris
recommendedtoensurecorrect
locationofventilators.
Backgroundventilatorsinstalle
din
wallsmayrequireaproprietary
wind
cowltoreducewindnoiseand
prevent
overventilation.
Extractterminals
wallandceilingmounted
a.
PSVextractterminalsshouldbelocatedintheceilingoronawalllessthan
400mmbelowtheceiling.
b.
Theextractterminalshouldhaveafreeareaofn
otlessthantheductcross-
sectionalarea.If
aconversionfittingisrequiredtoconnecttheductto
theterminalthen
theductcross-sectionalareas
houldbemaintained(or
exceeded)throughouttheconversionfittingso
asnottorestricttheflow.
Innon-sanitaryaccommodatio
n,
humiditycontrolledterminalsmaybe
usedtoincreasetheairflowdu
ring
periodsofincreasedhumidity,and
toreducetheairflowduringperiods
oflowhumidity.Humiditycontrols
shouldnotbeusedforsanitary
accommodationwhereodouristhe
mainpollutant.
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Table3:System2installationguidelines(continued)
Installationclause
s
Supplementaryinformation
2.0Ventilation
airinletsand
discharge
terminals
(continued)
Dischargetermina
ls
a.
ProprietaryproductsshouldbeusedthatarecompatiblewiththePSVduct
systemthathasb
eeninstalled.
b.
Therooftermina
lshouldnotallowingressoflar
geinsectsorbirdsand
shouldbedesign
edsothatrainisnotlikelytoen
tertheductandrundown
intothedwelling
.
c.Theterminalsho
uldalsobedesignedsuchthatanycondensationforming
insideitcannotrundownintothedwellingbutwill
runoffexternallyonto
theroof.
d.
Atileventilatoru
sedtoterminateaPSVsystemontheroofslopeshouldbe
positionednomorethan0.5mfromtheroofrid
ge.I
ftheductpenetrates
theroofmorethan0.5mfromtheridge,i
tshou
ldextendabovetheroof
slopetoatleastr
idgeheight.
RefertoDiagram2forfurtherdetails.
3.0Miscellaneous
Airtransfer
a.
Toensuregoodtransferofairthroughoutthedwelling,t
hereshouldbean
undercutofminimumarea7600mm
2in
allinternaldoorsabovethefloor
finish.T
hisisequ
ivalenttoanundercutof10mmforastandard760mm
widthdoor.
b.
Ensurethatthea
irtransferprovisionisunrestrictedafterfloorfinisheshave
beenlaid(e.g.ca
rpetsshouldnotencroach).Thisshouldbeachievedby
makinganundercutof10mmabovethefloorfi
nishifthefloorfinishis
fitted,orbya20
mmundercutabovethefloorb
oards,orothersurface,i
f
thefinishhasnotbeenfitted.
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Section 2 Natural ventilation and intermittent extract systems | 21
Table4:System2inspection
Recommendedmi
nimumrequirements
Supplementaryinformation
1.0Ductwo
rkand
terminals
Visualinspections
CarryoutthefollowingchecksandrecordtheresultsinSection5:
a.
Doesthesystem
installationcomplywiththeins
tallationclausesinTable3?
b.
Doesthenumbe
randsizeofterminalpointssat
isfyTable5.2
binADF?
c.Isallductworkandareallterminalsingoodconditionwithnoobvious
defectsthatwillbehazardousoraffectsystemp
erformance?
2.0Background
ventilators
Visualinspections
CarryoutthefollowingchecksandrecordtheresultsinSection5:
a.
Doesthesize,nu
mber,orientationandlocation
ofairinletssatisfyTable5.2
b
inADF?
b.
Hasanytempora
ryprotectionandpackagingbeenremovedfromall
backgroundventilators,anddoshuttersopenandclosecorrectly?
c.Isthereanadequ
atesealbetweentheventilatorproductandthewall/
windowframe?
Theequivalentareashouldbe
displayedonthebackground
ventilatorproduct.
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Diagram 2: Suitable layouts for PSV systems
The layouts shown in Diagram 2 are considered to be suitable for the majority of dwellings
of up to four storeys. Placing the outlet terminal at the ridge of the roof (Diagram 2(a)) is the
preferred option for reducing the adverse effects of wind gusts and certain wind directions.
A tile ventilator may be used to terminate aPSVsystem on the roof slope but the terminal
should be positioned no more than 0.5 m from the roof ridge. If the duct penetrates the
roof more than 0.5 m from the ridge, it should extend above the roof slope to at least ridge
height to ensure that the duct terminal is in the negative pressure region above the roof
(Diagram 2(b)).
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Section 2 Natural ventilation and intermittent extract systems | 23
Diagram 3: Suitable and unsuitable bends for passive stack ducts
Ducts should use no more than one offset (i.e. no more than two bends) and these shouldbe of the swept rather than sharp type to minimise flow resistance. Offsets at an
angle should be no more than 45 to the vertical (Diagram 3).
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Section 3
Continuous mechanical ventilationsystems
3.1 System 3 Continuous mechanical extract: centralisedand de-centralised
The information provided in Tables 5 and 6 gives guidance on good installation practiceand the procedures for the inspection, air flow measurement testing and commissioning of
continuous mechanical extract ventilation(MEV) systems for dwellings. The relevant
design guidance is given in ADF, in particular, Table 5.2c.
3.2 System 4 Continuous mechanical balanced systemswith heat recovery: centralised and single room
The information provided in Tables 7 and 8 gives guidance on good installation practice
and the procedures for the inspection, air flow measurement testing and commissioning
of continuous mechanical balanced ventilation with heat recovery(MVHR) systems
for dwellings. The relevant design guidance is given in ADF, in particular, Table 5.2d. The
installation and inspection guidance is also suitable forsingle room heat recovery
ventilators(SRHRV).
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Section 3 Continuous mechanical ventilation systems | 25
Table5:System3installationguidelines
Installationclause
s
Supplementaryinformation
1.0Continu
ous
extract
fans:
centralised
Continu
ous
extract
fans:
decentralised
Manufacturersde
tailsandspecificinstruction
s
a.
Theinformation
providedinthisTablesetsouttheminimumrecommended
proceduresforty
picalSystem3installations.
b.
Forfurtherprodu
ct-specificinformation,refertothemanufacturers
installationinstru
ctions.
c.Thesuitabilityof
connectionofacontinuousfan
systemtoacookerhood
mustfollowthemanufacturersguidance.
Locationoffanun
it
a.
Thefanunitshouldbelocatedinaccordancewiththemanufacturers
specifications.
b.
Ensurethefinallocationofequipmentofferssufficientspacetoallowaccess
formaintenance
.
c.Thefanunitshouldbeinstalledtoallowsufficientspaceforendoflife
replacementofthewholeunitorkeymechanical/electricalcomponents.
Thisshouldbeac
hievablewithouttheneedtoremovefixedstructuresor
significantlengthsofconnectedductwork.
d.
Thefanunitshouldbeinstalledonasoundstructure,w
hichisstableand
level.
Thelocationofthefanunitsho
uld
bechosentominimiseoverallduct
runlength,bothfromtheinternal
extractterminals/grillestothefanunit
andfromthefanunittotheexternal
dischargeterminal.
Unconditionedspaces,e.g.lof
ts,
maybecomeveryhotinsumm
er,
whichmayhaveimplicationsforboth
mechanicalandelectroniccom
ponent
life.Refertothemanufacturers
specificationforappropriate
environmentalconditions.
Thefanunitspigotarrangement
maydictatethelocationand
orientationofinstallation:toensure
optimumperformancereferto
the
manufacturersinstructions.
Ifafanunitisinstalledinanunheated
space,itmayneedtobeinsulated
tominimisetheriskofcondensation
formingwithinthefanunitcas
ing.
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Table5:System3installationguidelines(continued)
Installationclause
s
Supplementaryinformation
1.0Continu
ous
extract
fans:
centralised
Continu
ous
extract
fans:
decentralised
(continued)
Preparationforinstallation
a.
Aholeofasuitab
ledimensionthroughthefabricofthebuildingwill
berequiredfortheinstallationoftheduct.T
heholewill
needaslight
downwardangle
towardstheoutsidetopreven
twateringress.
b.
Whereductwork
penetratesabuildingsairbarrier,thecontinuityofthe
barriermustbem
aintained.T
henatureofthebarrierandeaseofachieving
aneffectivesealshouldbeconsideredbeforeho
lesaredrilled.
c.Forceilingmoun
tedfansorterminals/grilles,theholesshouldbecuttothe
minimumrequiredsizesuchthatthefan/grillesp
igotfitssnuglyintothehole.
d.
Itisimportantto
considertheplanningandinstallationofductworkinco-
ordinationwitho
thertradeactivitiesandinstallations,suchthatroutesare
designedwithou
tcompromisetotherequiredv
entilationairflowrates.
Installation
a.
Thefanunitshouldbeinstalledusingthemanufacturerssuppliedor
recommendedfi
xingbrackets.
Acoustic/anti-vibrationisolation
mayberequired.Thiswilld
epe
nd
onthenatureofthemounting
structure:refertothemanufac
turers
instructions.
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Section 3 Continuous mechanical ventilation systems | 27
Table5:System3installationguidelines(continued)
Installationclause
s
Supplementaryinformation
2.0Ductwo
rk
Ductinstallation
generalnotes
a.
Ductsshouldbesizedtominimisepressurelossandnoisegeneration.T
hisis
achievedbysizin
goftheductstolimittheairvelocity.
b.
Theroutingofductsshouldminimiseoverallductlengthandminimisethe
numberofbendsrequired.I
tisparticularlyimpo
rtanttominimisebendsin
mainductsoperatingathigherairvelocities.
c.Theneedforpriv
acy(acousticseparation)betweenroomsshouldbe
consideredwhen
planningductlayout.
d.
Whereroomairextractterminals/grillesarenotfittedwithfilters,sufficient
spacetoallowac
cessforcleaningductsshouldbeprovided.
e.
Ductingshouldb
einsulatedwhereitpassesthroughunheatedareasand
voids(e.g.loftsp
aces)withtheequivalentofatleast25mmofamaterial
havingathermalconductivityof0.0
4W/(m.K
)toreducethepossibilityof
condensationforming.W
hereaductextendsaboverooflevelthesection
abovetheroofshouldbeinsulatedoracondensatetrapshouldbefittedjust
belowrooflevel.
f.Horizontalducting,includingductinginwalls,shouldbearrangedtoslope
slightlydownwardsawayfromthefantopreventbackflowofanymoisture
intotheproduct.
g.
Verticalductingwill
requireacondensatetrapin
ordertopreventbackflow
ofanymoistureintotheproduct.
h.
Perforatedinsula
tedflexid
uct,usedtominimiseairborneacoustic
transmission,shouldnotbeusedbetweenthefanunitandexternal
dischargetermin
altopreventcondensationocc
urringwithintheinsulation
material.
i.
Whereductspas
sthroughfirebarriers,t
heymu
stbeappropriatelyfire
stoppedinaccordancewiththerequirementsofPartBoftheBuilding
Regulations(Fire
Safety).
Theductsizeandtypespecifiedby
thesystemdesignershouldalw
aysbe
used,tominimisepressureloss
and
noisegeneration.Mainductsshould
berunatthesamesizeasthefan
unitspigot.Ductsizeshouldth
enbe
reducedforbranchducts.
Aradialla
youtmayachieveacoustic
separationmoreeffectivelytha
na
branchedlayout.
Theperformanceoftheventila
tion
systemreliesonefficientair
distributionanditisvitalthatduct
installationisnotleftuntilthelast
momentwhentheonlymeans
of
overcomingobstructionsistoinstall
flexibleductswhererigidductshad
beenspecified.
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Table5:System3installationguidelines(continued)
Installationclause
s
Supplementaryinformation
2.0Ductwo
rk
(continued)
Installationofductsrigid
a.
Ductsshouldnotbeinstalledwheretheycanbe
easilydamaged,for
exampleacrosso
penloftareaswheretheymay
bestoodonorhaveitems
placedonthem,
breakingsealsandpossiblycru
shingtheduct.
b.
Connectionofcomponentsshouldnotresultin
significantairflow
resistance.Componentsshouldbeproprietarya
ndfiteasilytogether
withoutdistortio
n.
c.Rigidductrunsm
ustbeadequatelysupported.
Distortionofrectangularductmay
resultinsignificantreductiono
f
thefreeinternala
reaoftheduct,
increasingtheflowresistanceand
makingsealingmoredifficult.
Installationofductsflexible
a.
Ductsshouldnotbeinstalledwheretheycanbe
easilydamaged,for
exampleacrosso
penloftareaswheretheymay
bestoodonorhaveitems
placedonthem,
crushingtheductandrestrictin
gorpreventingallairflow
throughtheduct.
b.
Flexibleductshouldbepulledtaughttoensurethatthefullinternal
diameterisobtainedandflowresistanceminimised.T
hisisconsideredto
havebeenachievediftheductisextendedto90
%o
fitsmaximumlength.
c.Flexibleductworkshouldbesupportedatsuitab
leintervalstominimise
sagging.
d.
Bendsinflexibleductshouldhaveaminimumin
sideradiusequaltothe
diameterofthed
uctseeDiagram1.I
ftighterbendsarerequired,r
igid
bendsshouldbe
used.
Itissuggestedthatflexibleducts
shouldbesupportedatintervalsnot
exceeding600mm.
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Section 3 Continuous mechanical ventilation systems | 29
Table5:System3installationguidelines(continued)
Installationclause
s
Supplementaryinformation
2.0Ductwo
rk
(continued)
Ductconnections
a.
Allductconnectionsrequiresealing.W
hereduc
tsareinstalledagainsta
solidstructureth
iscanbedifficulttoachieve.In
suchlocationspreassembly
ofductsectionsshouldbeconsidered.T
hiswillrequirethatconnectionsare
permanenttoen
surethesealismaintainedduringinstallation.
b.
Whereaccessto
ductswill
notbepossibleafterconstructioniscomplete,
i.e.ductworkisw
ithinfloorandwallvoids,considerationshouldbegiven
topermanentco
nnectionandsealingwithanappropriatenon-hardening
sealant,andnotusingducttapetoachieveconnectionandsealing.
c.Connectionofle
ngthsofflexibleductmustuse
arigidconnectorandjubilee
clipsorsimilarto
ensurealongtermsealisachie
ved.Connectionsoflengths
offlexibleductshouldnotbetaped-only.
3.0Ventilation
airinletsand
interna
lair
transfer
Backgroundventilators
a.
Backgroundventilatorsshouldbeprovidedtom
eettheminimumrequired
equivalentareao
fventilationspecifiedbyTable
5.2cofADF.
b.
Forwallmountedbackgroundventilatorsmake
anopeninginthewall
inaccordancewiththemanufacturersinstructionsforthesizerequired.
Ensurethatthere
arenoobstructionsintheopening.
c.Installthewallor
windowventilatorproductinaccordancewiththe
manufacturersinstructions.
d.
Ensurethatwallorwindowventilatorproductsaresealedtotheirsurrounds
usingaproprieta
rysealantasrecommendedby
themanufacturer.
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Table5:System3installationguidelines(continued)
Installationclause
s
Supplementaryinformation
3.0Ventilation
airinlets
andinternal
airtransfer
(continued)
Airtransfer
a.
Toensuregoodtransferofairthroughoutthedwelling,t
hereshouldbean
undercutofminimumarea7600mm
2in
allinternaldoorsabovethefloor
finish.T
hisisequ
ivalenttoanundercutof10mmforastandard760mm
widthdoor.
b.
Ensurethatthea
irtransferprovisionisunrestrictedafterfloorfinisheshave
beenlaid(e.g.ca
rpetsshouldnotencroach).Thisshouldbeachievedby
makinganundercutof10mmabovethefloorfi
nishifthefloorfinishis
fitted,orbya20
mmundercutabovethefloorb
oards,orothersurface,i
f
thefinishhasnotbeenfitted.
4.0Roome
xtract
airterm
inals/
grilles
Extractterminals/grillesgeneralnotes
a.
Allroomairextra
ctterminalsshouldbeinstalled
asdetailedbythesystem
designer.
b.
Roomairextract
terminalsshouldbeinstalledasclosetoceilinglevelas
practical,toensu
rewarmmoistairisremovedfromeachspace.
Fixedterminalsg
rillesorlouvers
a.
Iftheroomextractairterminalsarefixed,ensurethateffectivebalancingof
thesystemcanb
eachieved.I
fafacilityisnotpro
videdwithinthefanunit
thendamperssh
ouldbeinstalledwithintheductsystemtoallowbalancing
whenthesystem
iscommissioned.
Adjustabletermin
als/grilles
a.
Ensureeachterm
inal/grillecanbelockedinitscommissionedpositiononce
systembalanceh
asbeenachieved.I
tisvitalforthecorrectoperationofthe
systemthatthes
ystemremainsbalancedinitsc
ommissionedstate.
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Section 3 Continuous mechanical ventilation systems | 31
Table5:System3installationguidelines(continued)
Installationclause
s
Supplementaryinformation
5.0Externa
l
discharge
terminal
Dischargetermina
lsroofandwallmounted
a.
Proprietaryterminalsshouldbeused.
b.
Ensurethatthefreeareaoftheterminalopeningisaminimumof90%
of
thefreeareaoftheductingbeingused.
c.Thelocationoftheexternaldischargeterminalshouldensurethatthe
potentialforrecirculationofextractairthrough
ventilationairinletsis
minimised.
6.0Controls
Controlsgeneralnotes
a.
Continuousventilationsystemsshouldnotallow
theoccupiertoturnoffthe
fanotherthanatthelocalisolator.Provisionofa
non/offfunctionwill
result
inthefansbeing
operatedintermittentlyandth
erequiredcontinuousair
flowventilationratesnotbeingachieved.
b.
Wheresensorsarenotpre-installedwithinthefanunit,oradditional
optionalsensors
canbeinstalled,onlythesenso
rsspecifiedbythe
manufacturerof
thefanunitshouldbeinstalled
.
c.Ifsensorsareduc
tmounted,t
heirlocationshou
ldbenotedandprovisionfor
accessformaintenanceorreplacementmade.
d.
Ifcontrolofthefanspeedisundertakenmanually,t
heoperationofthefan
inboostmodesh
ouldbemadeobvious.Thiswill
minimisethelikelihoodof
itbeingleftinthismodeunnecessarily.
e.
Humiditycontrolshouldnotbeusedinsanitary
accommodation,w
here
odouristhemainpollutant.
Installationofalternativesenso
rs
mayresultincontrolfunctions
not
performingcorrectly.
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Table5:System3installationguidelines(continued)
Installationclause
s
Supplementaryinformation
6.0Controls
(continued)
Controlslocation
andconfiguration
a.
Installationofmanualcontrolsforthesystemmustmeettherequirements
ofPartMoftheBuildingRegulations.
b.
Installationofroomsensorsshouldfollowthem
anufacturersguidanceon
positioning.
c.Wherecontrolofthefanspeedisundertakenm
anually,switchingshould
beprovidedlocallytothespacesbeingserved,i.e.bathroomsandkitchen.
Provisionofasinglecentrallylocatedswitchisnotsufficientandwill
resultin
fansbeingleftin
inappropriatemodesofoperation.
ApprovedDocumentM,Sectio
n8.3,
recommendsthatswitchessho
uld
belocatedbetween450mmand
1200mmfromfinishedfloorlevel.
7.0Continu
ous
extract
fans:
decentralised
In-ductinstallation
a.
Thefanunitshouldbeadequatelysupportedus
ingthemanufacturers
suppliedorrecom
mendedfixingbrackets.
b.
Accessshouldbe
providedtothefanunitformaintenanceandreplacement
attheendofitso
perationallife.
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Section 3 Continuous mechanical ventilation systems | 33
Table6:System3inspection,testingandcommissioning
Recommendedmi
nimumrequirements
Supplementaryinformation
1.0System
overvie
w
Visualinspections
CarryoutthefollowingchecksandrecordtheresultsinSection5:
a.
Doesthesystem
installationcomplywiththeins
tallationclausesinTable5?
b.
Isthesysteminst
alledinaccordancewithdesign
criteria?
c.Isallductworkandareallterminalsingoodconditionwithnoobvious
defectsthatwillbehazardousoraffectsystemp
erformance?
Initialstart-up
a.
Istheairflowdirectioncorrectateachroomterminal?
b.
Arethereanyabnormalnoisesonstart-uporwhenthesystemisrunningin
normalbackgrou
ndventilationmode?
Somefanunitshaveastart-up
diagnosticsequencethatrunsthe
fansatmaximumspeedforap
eriod
beforerevertingtonormalope
ration
refertothemanufacturersoperating
instructions.
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Table6:System3inspection,testingandcommissioning
Minimumrequirem
ents
Supplementaryinformation
2.0Commissioning:
airflow
balancingand
measur
ement
Airflowbalancing
a.
Thesystemshouldbebalancedtoensurethatdesignairflowratesare
achievedateach
roomterminal/grille.Asthereareseveralcombinationsof
roomterminal/grille(referredtoasaterminalfro
mhereon)andfancontrol
thatmaybeused
indomesticsystems,thefanm
anufacturersinstructions
shouldbefollow
edtoachievebalancing.I
fspec
ificdetailsarenotincluded
thefollowingpro
cedureshouldbeadopted:
i.
Adjustable
terminalsandafixed(stepp
ed)speedfan.
Thefanspee
dshouldbesettoachievethed
esiredcontinuousflowrate.
Theindexterminalflowrateissettofullyop
enandallothergrillesare
adjustedtoa
chievetherequiredflowsateachterminal.
Ifthetotalflo
wratecannotbeachievedthroughalltheterminalsthen
thefanspeedshouldbeincreased.
Ifalltheterm
inalshavetobeclosedsignificantlytoachieveonlythe
requiredairfl
owratethenreducethefansp
eedandrebalancethe
terminals.
ii.Adjustable
terminalsandcontrollables
peedfan.
Thefanspee
dshouldbesetapproximatelytoachievethedesired
continuousfl
owrate.
Theindexterminalflowrateissetwiththeterminalfullyopenand
allotherterm
inalsareadjustedtoachieveth
erequiredflowsateach
terminal.
Iftheindexterminalhastobeclosedtoachieveonlytherequiredair
flowrate,thenreducethefanspeedandrebalancetheterminals.
Note:Thisistheapproved
procedureforcommissionin
g
asrequiredbytheBuilding
Regulations.
Theindexterminal/grillecanbe
assumedtobetheterminalfur
thest
fromthefanunit.
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Section 3 Continuous mechanical ventilation systems | 35
Table6:System3inspection,testingandcommissioning(contin
ued)
Minimumrequirem
ents
Supplementaryinformation
2.0Commissioning:
airflow
balancingand
measur
ement
(continued)
iii.Fixedterminalswithflowadjustmentb
yductdamperorsimilar
deviceatth
efanunit.
Asi.orii.abo
vedependingonthetypeoffa
nspeedcontrol.
iv.Adjustable
terminalsandfixedvolume
flowfan.
Thefanspee
dshouldbesettoachievethed
esiredcontinuousflowrate.
Theindexterminalflowrateissetwiththeterminalfullyopenand
allotherterm
inalsareadjustedtoachieveth
erequiredflowsateach
terminal.Adjustmentoftheterminalsachievesbalancingonly;total
flowrateisg
overnedbythefancontrolsetting.Greatcareshould
betakennot
toclosetheterminalstoofarasthefanunitwill
always
maintainaconstantvolumetricflowrate;closingtheterminalswill
only
requirethefantoworkhardertoachieveagivenairflowrate.
v.Fixedterminalswithautomaticflowad
justmentatthefanunit.
Thefanspee
dshouldbesettoachievethed
esiredcontinuousflowrate.
Theflowsarebalancedbyautomaticdevice
slocatedwithinthefanunit,
andnoadjus
tmentcanbemade.
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Table6:System3inspection,testingandcommissioning(contin
ued)
Minimumrequirem
ents
Supplementaryinformation
2.0Commis
sioning:
airflow
balancingand
measur
ement
(continued)
Airflowmeasurem
ents
a.
Ensurethatback
groundventilatorsorotherairtransferdevicesareopen.
b.
Ensureallinterna
landexternaldoorsandwindowsareclosed,including
roomsinwhichm
easurementsarebeingcarried
out.
c.Airflowmeasure
mentsshouldbeperformedusingacalibratedairflow
devicewithprop
rietaryhoodattachmentandre
sultsrecordedinlitresper
second(l/s).Refe
renceshouldbemadetodesignairflowrates.
d.
Recordtheairflo
wrateateachroomterminalo
nthecommissioning
sheetinSection5,a
longwiththedesignairflow
rateforeachterminal.
Measurementsshouldbetakenatbothmaximu
mrateandminimumrate
fanspeeds.
e.
Itisrecommende
dthatavaneanemometerors
imilardeviceisused
tobalanceandm
easuretheairflowratesateac
hroomterminal.The
instrumentwillrequireahoodtobeattachedto
allowittocoverthe
terminal.
f.Theinstruments
houldbecalibratedannuallyan
dbecapableofachieving
anaccuracyof
5percent.
Note:Thisistheapproved
procedureforairflow
measurementasrequiredb
ythe
BuildingRegulations.
Themostcommonmethodisthe
useofavaneanemometer,orsimilar,
placedinahoodwhichcoversthe
terminalto
measuretheextractair
flowrate.
Calibrationofmeasurement
equipmentshouldbeundertaken
annuallybyreturningtheinstrument
toaUKASaccreditedcalibratio
n
centre.
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Section 3 Continuous mechanical ventilation systems | 37
Table6:System3inspection,testingandcommissioning(contin
ued)
Recommendedmi
nimumrequirements
Supplementaryinformation
3.0Controls
Installation
a.
Ensurealllocalcontrolshavebeeninstalledfollo
wingthemanufacturers
instructions.
b.
Ensurealllocalcontrolsareadequatelylabelled,
indicatingtheirfunction
clearly.
c.Ifsensorshavebeeninstalledseparatelyfromth
efanunitensureinstallation
followsthemanufacturersinstructions.
d.
Wherecontrolofthefanisautomated,t
hecontrolsshouldbeconfiguredto
minimisetheocc
urrenceofhunting.
e.
Ifmanualcontrolof,forexample,heatexchang
erby-passisprovided,c
lear
anddetailedinstructionsshouldbemadeavailabletotheoccupier.
Ifhunting(thecontinualincrea
se
anddecreaseoffanspeed)does
occur,occupantsmayseektom
odify
thecontrolofthesystemorturnit
offaltogethertoremovethenoise
nuisance.
Testingoperation
a.
Asfaraspractica
lthecorrectoperationofeachcontrolfunctionshouldbe
tested.
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Table7:System4installationguidelines
Installationclause
s
Supplementaryinformation
1.0Continu
ous
supplyand
extract
with
heatrecovery:
centralised
Continu
ous
singleroom
supplyand
extract
with
heatrecovery
Manufacturersde
tailsandspecificinstruction
s
a.
Theinformation
providedinthisTablesetsouttheminimumrecommended
proceduresforty
picalSystem4installations.
b.
Forfurtherprodu
ct-specificinformation,refertothemanufacturers
installationinstru
ctions.
c.Thesuitabilityof
connectionofacontinuousfan
systemtoacookerhood
mustfollowthemanufacturersguidance.
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Section 3 Continuous mechanical ventilation systems | 39
Table7:System4installationguidelines(continued)
Installationclause
s
Supplementaryinformation
1.0Continu
ous
supplyand
extract
with
heatrecovery:
centralised
Continu
ous
singleroom
supplyand
extract
with
heatrecovery
(continued)
Locationoffanun
it
a.
Thefanunitshouldbelocatedasspecifiedbyth
esystemdesigner.
b.
Fanunitsshould
beinstalledtoallowsufficientspacetoundertakeroutine
maintenanceon
filtersandheatexchangerbloc
kasappropriate.
c.Fanunitsshould
beinstalledtoallowsufficientspaceforendoflife
replacementofthewholeunitorofkeymechan
ical/electricalcomponents.
Thisshouldbeac
hievablewithouttheneedtoremovefixedstructuresor
significantlengthsofconnectedductwork.
d.
Thefanunitshouldbeinstalledonasoundstructure,w
hichisstableand
level.
e.
Ifthefanunitisn
otpre-insulated,insulationsho
uldbeaddedtominimise
theriskofcondensationformingwithin,oron,thefanunitcasing.
f.Acondensatedrainshouldbeinstalledfromthe
fanunittoanappropriate
drainlocation.Thecondensatepipeshouldbeinstalledtohaveaminimum
5fallfromthefanunit.
g.
Thecondensatedrainshouldbeadequatelysecuredandwherepassing
throughanunhe
atedspacemustbeadequatelyinsulatedtoprevent
freezing.
AdditionalnotesforSRHRV
a.
Donotinstallthe
unitinthecornerofaroomas
thismayresultinshort
circuitingofairfl
ows.
Thelocationofthefanunitsho
uld
bechosentominimiseoverallduct
runlength,bothfromtheinternal
terminals/grillestothefanunit
and
fromthefanunittotheexternal
dischargeterminal.
Unconditionedspaces,e.g.lof
ts,
maybecomeveryhotinsumm
er,
whichmayhaveimplicationsforboth
mechanicalandelectroniccom
ponent
liferefertothemanufacturers
specificationforappropriate
environmentalconditions.
Thefanunitspigotarrangement
maydictatethelocationand
orientationofinstallation:toensure
optimumperformancereferto
the
manufacturersinstructions.
Therateofcondensateformationmay
beuptoseverallitresperday,a
ndthis
shouldbeconsideredwhenchoosing
thedrainlocation.
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Table7:System4installationguidelines(continued)
Installationclause
s
Supplementaryinformation
1.0Continu
ous
supplyand
extract
with
heatrecovery:
centralised
Continu
ous
singleroom
supplyand
extract
with
heatrecovery
(continued)
Preparationforinstallation
a.
Aholeofasuitab
ledimensionthroughthefabricofthebuildingwill
berequiredfortheinstallationoftheduct.T
heholewill
needaslight
downwardangle
towardstheoutsidetopreven
twateringress.
b.
Whereductwork
penetratesabuildingsairbarrier,thecontinuityofthe
barriermustbem
aintained.T
henatureofthebarrierandeaseofachieving
aneffectivesealshouldbeconsideredbeforeho
lesaredrilled.
c.Forceilingmoun
tedfansorterminals/grilles,theholesshouldbecuttothe
minimumrequiredsizesuchthatthefan/grillesp
igotfitssnuglyintothehole.
d.
Itisimportantto
considertheplanningandinstallationofductworkinco-
ordinationwitho
thertradeactivitiesandinstallations,suchthatroutesare
designedwithou
tcompromisetotherequiredv
entilationairflowrates.
Installation
a.
Thefanunitshouldbeinstalledusingthemanufacturerssuppliedor
recommendedfi
xingbrackets.
Acoustic/anti-vibrationisolation
mayberequired.Thiswilld
epe
nd
onthenatureofthemounting
structurerefertothemanufa
cturers
instructions.
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Section 3 Continuous mechanical ventilation systems | 41
Table7:System4installationguidelines(continued)
Installationclause
s
Supplementaryinformation
2.0Ductwo
rk
Ductinstallation
generalnotes
a.
Ductsshouldbesizedtominimisepressurelossandnoisegeneration.T
hisis
achievedbysizin
goftheductstolimittheairvelocity.
b.
Theroutingofductsshouldaimtominimiseove
rallductlengthand
minimisethenumberofbendsrequired.I
tisparticularlyimportantto
minimisebendsinmainductsoperatingathigherairvelocities.
c.Theneedforpriv
acy(acousticseparation)betweenroomsshouldbe
consideredwhen
planningductlayout.
d.
Whereroomairextractterminals/grillesarenotfittedwithfilters,
considerationshouldbegiventotheneedtoaccessductsforcleaning.
e.
Ductingshouldb
einsulatedwhereitpassesthroughunheatedareasand
voids(e.g.loftsp
aces)withtheequivalentofatleast25mmofamaterial
havingathermalconductivityof0.0
4W/(m.K
)toreducethepossibilityof
condensationforming.W
hereaductextendsexternallyaboverooflevelthe
sectionabovetheroofshouldbeinsulatedoracondensatetrapshouldbe
fittedjustbelow
rooflevel.
Theductsizeandtypespecifiedby
thesystemdesignershouldalw
aysbe
used,tominimisepressureloss
and
noisegeneration.Mainductsshould
berunatthesamesizeasthefan
unitspigot.Ductsizeshouldth
enbe
reducedforbranchducts.
Aradialla
youtmayachieveacoustic
separationmoreeffectivelytha
na
branchedlayout.
Theperformanceoftheventila
tion
systemreliesonefficientair
distributionanditisvitalthatduct
installationisnotleftuntilthelast
momentwhentheonlymeans
of
overcomingobstructionsistoinstall
flexibleductswhererigidductshave
beenspecified.
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Table7:System4installationguidelines(continued)
Installationclause
s
Supplementaryinformation
2.0Ductwo
rk
(continued)
a.
Ductswithinthe
buildingheatedenvelopecarry
ingcoldairbetweenthe
externalsupply/d
ischargeterminalsandthefan
unitshouldbeinsulatedand
wrappedadditio
nallywithavapourbarrierouts
idetheinsulationtoprevent
condensationoc
curringwithintheinsulationmaterial.
b.
Horizontalducting,includingductinginwalls,shouldbearrangedtoslope
slightlydownwardsawayfromthefantopreventbackflowofanymoisture
intotheproduct.
c.Verticalductingwill
requireacondensatetrapin
ordertopreventbackflow
ofanymoistureintotheproduct.
d.
Perforatedinsula
tedflexid
uct,usedtominimiseairborneacoustic
transmission,shouldnotbeusedbetweenthefanunitandexternal
dischargetermin
altopreventcondensationocc
urringwithintheinsulation
material.
e.
Whereductwork
penetratesabuildingsairbarrier,identifyonbuilding
drawingsanden
surethatcontinuityofbarrierismaintained.
f.Whereductspas
sthroughfirebarriers,t
heymu
stbeappropriatelyfire
stoppedinaccordancewiththerequirementsofPartBoftheBuilding
Regulations(Fire
safety).
Installationofductsrigid
a.
Ductsshouldnotbeinstalledwheretheycanbe
damaged,forexample
acrossopenloftareaswheretheymaybestood
onorhaveitemsplacedon
them,breakings
ealsandpossiblycrushingtheduct.
b.
Connectionofcomponentsshouldnotresultin
significantairflow
resistance.Componentsshouldbeproprietarya
ndfiteasilytogether
withoutdistortio
n.
c.Rigidductrunsm
ustbeadequatelysupported.
Distortionofrectangularductmay
resultinsignificantreductiono
f
thefreeinternala
reaoftheduct,
increasingtheflowresistanceand
makingsealingmoredifficult.
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Section 3 Continuous mechanical ventilation systems | 43
Table7:System4installationguidelines(continued)
Installationclause
s
Supplementaryinformation
2.0Ductwo
rk
(continued)
Installationofductsflexible
a.
Ductsshouldnotbeinstalledwheretheycanbe
damaged,forexample
acrossopenloftareaswheretheymaybestood
onorhaveitemsplacedon
them,crushingtheductandrestrictingorpreve
ntingallairflowthroughthe
duct.
b.
Flexibleductshouldbepulledtaughttoensurethatthefullinternaldiameter
isobtainedandfl
owresistanceminimised.T
hisisconsideredtohavebeen
achievediftheductisextendedto90percento
fitsmaximumlength.
c.Flexibleductworkshouldbesupportedatsuitab
leintervalstominimise
sagging.
d.
Bendsinflexibleductshouldhaveaminimumin
sideradiusequaltothe
diameterofthed
uctseeDiagram1.I
ftighterbendsarerequired,r
igid
bendsshouldbe
used.
Itissuggestedthatflexibleducts
shouldbesupportedatintervalsnot
exceeding600mm.
Ductconnections
a.
Allductconnectionsrequiresealing.W
hereduc
tsareinstalledagainsta
solidstructureth
iscanbedifficulttoachieve.In
suchlocationspreassembly
ofductsectionsshouldbeconsidered.T
hiswillrequirethatconnectionsare
permanenttoen
surethesealismaintainedduringinstallation.
b.
Whereaccessto
ductswill
notbepossibleafterconstructioniscomplete,
i.e.w
ithinfloora
ndwallvoids,considerationshouldbegiventopermanent
connectionandsealingwithanappropriatenon
-hardeningsealant,andnot
usingducttapet
oachieveconnectionandsealing.
c.Connectionofle
ngthsofflexibleductmustuse
arigidconnectorandjubilee
clipsorsimilarto
ensurealongtermsealisachie
ved.Connectionsoflengths
offlexibleductshouldnotbetaped-only.
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Table7:System4installationguidelines(continued)
Installationclause
s
Supplementaryinformation
3.0Interna
l
ventilationair
transfer
Airtransfer
a.
Toensuregoodtransferofairthroughoutthedwelling,t
hereshouldbean
undercutofminimumarea7600mm
2in
allinternaldoorsabovethefloor
finish.T
hisisequ
ivalenttoanundercutof10mmforastandard760mm
widthdoor.
b.
Ensurethatthea
irtransferprovisionisunrestrictedafterfloorfinisheshave
beenlaid(e.g.ca
rpetsshouldnotencroach).Thisshouldbeachievedby
makinganundercutof10mmabovethefloorfi
nishifthefloorfinishis
fitted,orbya20
mmundercutabovethefloorb
oards,orothersurface,i
f
thefinishhasnotbeenfitted.
AdditionalnotesforSRHRV
a.
Freeairmovementbetweenroomsisnotrequiredaseachroomcontains
asingleroomheatrecoveryventilator(SRHRV)u
nit.T
heseunitshavea
balancedsupply
andextractairflowrate.I
tisho
weverrecommendedthat
theprovisionsin
3a.and3b.aremaintainedtom
inimiseanyimbalanceof
flowswithinrooms.
4.0Rooms
upply
andext
ractair
terminals/
grilles
Supplyandextractterminals/grillesgeneralnotes
a.
Allroomairextra
ctterminalsshouldbeinstalled
asdetailedbythesystem
designer.
b.
Roomairextract
terminalsshouldbeinstalledasclosetoceilinglevelas
practical,toensu
rewarmmoistairisremovedfromeachspace.
c.Roomsupplyairterminalsmustnotbelocateda
djacenttowalls,unless
designedtodischargeairawayfromthewall,asthismayresultindown
draughts.
d.
Inopenplanareaswherebothsupplyandextractterminalsmaybeinstalled,
e.g.k
itchendine
rs,t
heterminalsshouldbeadequatelyseparatedtoensure
shortcircuitingis
minimised.
e.
Thenumberand
locationofterminalsinstalledinaspaceshouldensure
effectiveairdistributionandensurethatairnoiseisnotanuisancewhenthe
systemisoperatingatboostairflowrates.
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Section 3 Continuous mechanical ventilation systems | 45
Table7:System4installationguidelines(continued)
Installationclause
s
Supplementaryinformation
4.0Rooms
upply
andext
ractair
terminals/
grilles
(continued)
Fixedterminalsg
rillesorlouvers
a.
Ifthesupplyand
extractairterminalsarefixed,e
nsurethateffective
balancingofthe
systemcanbeachieved.I
fafac
ilityisnotprovidedwithin
thefanunitthen
dampersshouldbeinstalledw
ithintheductsystemto
allowbalancingwhenthesystemiscommission
ed.
Adjustabletermin
als/grilles
a.
Ensureeachterm
inal/grillecanbelockedinitscommissionedpositiononce
systembalanceh
asbeenachieved.I
tisvitalforthecorrectoperationofthe
systemthatthes
ystemremainsbalancedinitsc
ommissionedstate.
5.0Externa
l
discharge
terminal
MVHR
Externa
l
supplyand
discharge
terminal
Supplyanddischa
rgeterminalsroofandwallmounted
a.
Proprietaryterminalsshouldbeused.
b.
Ensurethatthefreeareaoftheterminalopeningisaminimumof90per
centofthefreea
reaoftheductingbeingused.
c.Thelocationoftheexternaldischargeterminalshouldensurethatthe
potentialforrecirculationofextractairthrough
thesupplyairterminalis
minimised.
Itisrecommendedthatthesup
plyand
extractairterminalsareseparatedby
aminimumof300mmhorizontally
ifplacedonthesamefaadeofa
building.
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Table7:System4installationguidelines(continued)
Installationclause
s
Supplementaryinformation
6.0Controls
Controlsgeneralnotes
a.
Continuousventilationsystemsshouldnotallow
theoccupiertoturnoffthe
fanotherthanatthelocalisolator.Provisionofa
non/offfunctionwill
result
inthefansbeing
operatedintermittentlyandth
erequiredcontinuousair
flowventilationratesnotbeingachieved.
b.
Wheresensorsarenotpre-installedwithinthefanunit,oradditional
optionalsensors
canbeinstalled,onlythesenso
rsspecifiedbythe
manufacturerof
thefanunitshouldbeinstalled
.
c.Ifsensorsareduc
tmounted,t
heirlocationshou
ldbenotedandprovisionfor
accessformaintenanceorreplacementmade.
d.
Ifcontrolofthefanspeedisundertakenmanually,t
heoperationofthefan
inboostmodesh
ouldbemadeobvious.Thiswill
minimisethelikelihoodof
itbeingleftinthismodeunnecessarily.
e.
Humiditycontrolshouldnotbetheonlycontrol
usedinsanitary
accommodation
,whereodouristhemainpollu
tant.
Installationofalternativesenso
rs
mayresultincontrolfunctions
not
performingcorrectly.
Controlslocation
andconfiguration
a.
Installationofmanualcontrolsforthesystemmustmeettherequirements
ofPartMoftheBuildingRegulations.
b.
Installationofroomsensorsshouldfollowthem
anufacturersguidanceon
positioning.
c.Wherecontrolofthefanspeedisundertakenm
anually,switchingshould
beprovidedlocallytothespacesbeingserved,i.e.bathroomsandkitchen.
Provisionofasinglecentrallylocatedswitchisnotsufficientandwill
resultin
fansbeingleftin
inappropriatemodesofoperation.
ApprovedDocumentM,Sectio
n8.3,
recommendsthatswitchessho
uld
belocatedbetween450mmand
1200mmfromfinishedfloorlevel.
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Section 3 Continuous mechanical ventilation systems | 47
Table7:System4installationguidelines(continued)
Installationclause
s
Supplementaryinformation
7.0Singler
oom
heatrecovery
ventilator
(SRHRV
)
devices
Ventilationofwho
lebuilding
a.
Theseproductsp
rovidebalancedventilationfor
oneroomonly;the
ventilationofallspacesshouldmeettherequire
mentsoftheBuilding
Regulations.
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Table8:System4inspection,testingandcommissioning
Recommendedmi
nimumrequirements
Supplementaryinformation
1.0System
overvie
w
Visualinspections
CarryoutthefollowingchecksandrecordtheresultsinSection5:
a.
Doesthesystem
installationcomplywiththeins
tallationclausesinTable7?
b.
Isthesysteminst
alledinaccordancewithdesign
criteria?
c.Isallductworkandareallterminalsingoodconditionwithnoobvious
defectsthatwillbehazardousoraffectthesyste
mperformance?
Initialstart-up
a.
Istheairflowdirectioncorrectateachroomterminal,supplyandextract?
b.
Arethereanyabnormalnoisesonstart-uporwhenthesystemisrunningin
normalbackgrou
ndventilationmode?
Somefanunitshaveastart-up
diagnostic
sequencethatrunsthefansatmaximum
speedforaperiodbeforerevertingtonormal
operationrefertothemanufacturers
operatinginstructions.
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Section 3 Continuous mechanical ventilation systems | 49
Table8:System4inspection,testingandcommissioning(contin
ued)
Minimumrequirem
ents
Supplementaryinformation
2.0Commissioning:
airflow
balancingand
measur
ement
Airflowbalancing
a.
Thesystemshouldbebalancedtoensurethatdesignairflowratesare
achievedateach
roomterminal/grille.Asthereareseveralcombinations
ofroomterminal/grilleandfancontrolthatmay
beusedindomestic
systems,thefanmanufacturersinstructionssho
uldbefollowedtoachieve
balancing.I
fspecificdetailsarenotincludedthe
followingprocedureshould
beadopted:
i.
Adjustable
terminalsandafixed(stepp
ed)speedfan.
Thefanspee
dshouldbesettoachievethed
esiredcontinuousflowrate.
Theindexterminalflowrateissettofullyop
enandallotherterminals
areadjusted
toachievetherequiredflowsateachterminal.
Ifthetotalflo
wratecannotbeachievedthroughalltheterminalsthen
thefanspeedshouldbeincreased.
Ifalltheterm
inalshavetobeclosedsignificantlytoachieveonlythe
requiredairfl
owratethenreducethefansp
eedandrebalancethe
terminals.
ii.Adjustable
terminalsandcontrollables
peedfan.
Thefanspee
dshouldbesetapproximatelytoachievethedesired
continuousfl
owrate.
Theindexterminalflowrateissetwiththeterminalfullyopenand
allotherterm
inalsareadjustedtoachieveth
erequiredflowsateach
terminal.
Iftheindexterminalhastobeclosedtoachieveonlytherequiredair
flowrate,thenreducethefanspeedandrebalancetheterminals.
Note:Thisistheapprovedp
rocedure
forcommissioningasrequiredbythe
BuildingRegulations.
Theindexterminal/grillecanbeassumedto
betheterminalfu
rthestfromthefanunit.
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Table8:System4inspection,testingandcommissioning(contin
ued)
Minimumrequirem
ents
Supplementaryinformation
2.0Commis
sioning:
airflow
balancingand
measur
ement
(continued)
iii.Fixedterminalswithflowadjustmentb
yductdamperorsimilar
deviceatth
efanunit.
Asi.orii.abo
vedependingonthetypeoffa
nspeedcontrol.
iv.Adjustable
terminalsandfixedvolume
flowfan.
Thefanspee
dshouldbesettoachievethed
esiredcontinuousflowrate.
Theindexterminalflowrateissetwiththeterminalfullyopenand
allotherterm
inalsareadjustedtoachieveth
erequiredflowsateach
terminal.Adjustmentoftheterminalsachievesbalancingonly;total
flowrateisg
overnedbythefancontrolsetting.Greatcareshould
betakennot
toclosetheterminalstoofarasthefanunitwill
always
maintainaconstantvolumetricflowrate;closingtheterminalswill
only
requirethefantoworkhardertoachieveagivenairflowrate.
v.Fixedterminalswithautomaticflowad
justmentatthefanunit.
Thefanspee
dshouldbesettoachievethed
esiredcontinuousflowrate.
Theflowsarebalancedbyautomaticdevice
slocatedwithinthefanunit,
andnoadjus
tmentcanbemade.
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Section 3 Continuous mechanical ventilation systems | 51
Table8:System4inspection,testingandcommissioning(contin
ued)
Minimumrequirem
ents
Supplementaryinformation
2.0Commis
sioning:
airflow
balancingand
measur
ement
(continued)
Airflowmeasurem
ents
a.
Ensureallinterna
landexternaldoorsandwindowsareclosed,including
roomsinwhichm
easurementsarebeingcarried
out.
b.
Airflowmeasure
mentsshouldbeperformedusingacalibratedairflow
devicewithprop
rietaryhoodattachmentandre
sultsrecordedinlitresper
second(l/s).Refe
renceshouldbemadetodesignairflowrates.
c.Recordtheairflo
wrateateachroomterminalo
nthecommissioning
sheetinSection5,a
longwiththedesignairflow
rateforeachterminal.
Measurementsshouldbetakenatbothmaximu
mrateandminimumrate
fanspeeds.
d.
Itisrecommende
dthatavaneanemometerors
imilardeviceisused
tobalanceandm
easuretheairflowratesateac
hroomterminal.The
instrumentwillrequireahoodtobeattachedto
allowittocoverthe
terminal.
e.
Theinstruments
houldbecalibratedannuallyan
dbecapableofachieving
anaccuracyof
5percent.
AdditionalnotesforSRHRV
a.
Thesupplyande
xtractconfigurationofsomefa
nunitsmayprevent
measurementof
theairflowrates.Insuchcases,ifthemanufacturers
installationinstru
ctionshavebeenfollowedthe
airflowratesspecifiedfor
thatproductmustbeassumedtohavebeenach
ieved.
Note:Thisistheapproved
procedureforairflow
measurementasrequiredb
ythe
BuildingRegulations.
Calibrationofmeasurement
equipmentshouldbeundertaken
annuallybyreturningtheinstrument
toaUKASaccreditedcalibratio
n
centre.
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Table8:System4inspection,testingandcommissioning(contin
ued)
Recommendedmi
nimumrequirements
Supplementaryinformation
3.0Controls
Installation
a.
Ensurealllocalcontrolshavebeeninstalledfollo
wingthemanufacturers
instructions.
b.
Ensurealllocalcontrolsareadequatelylabelled,
indicatingtheirfunction
clearly.
c.Ifsensorshavebeeninstalledseparatelyfromth
efanunit,ensurethe
installationfollow
sthemanufacturersinstructions.
d.
Wherecontrolofthefanisautomated,t
hecontrolsshouldbeconfiguredto
minimisetheocc
urrenceofhunting.
e.
Ifmanualcontrolof,forexample,heatexchang
erby-passisprovided,c