National Weatherization Conference Ventilation Best .... Nagan... · Cooking. 9. Breathing. 9. Plants. 9. Pets. 9. ... ‘Ventilation strategies’ & equipment ... Stack head mounted

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Home Building Technology ServicesHome Building Technology Services 1

Presented by

Joe NaganJoe Nagan, Home Building Technology Services

Ventilation Best Practices &Ventilation Best Practices &

airflow verificationairflow verification

National Weatherization ConferenceNational Weatherization Conference



FIELD RESEARCHFIELD RESEARCH

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Objectives for this session:Objectives for this session:

Review ventilation design strategies

Review multiple installation challenges

Discuss YOUR YOUR concerns

NOTE: Questions are encouraged during this presentation, jump right in !


Reasons to ventilateReasons to ventilate??PeoplePeople-- IAQIAQ

Building durabilityBuilding durability

PostPost--weatherizationweatherization


BlowerBlower--door testing confirms door testing confirms tightness goalstightness goals!!

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ISSUESISSUES that that should beshould be considered:considered:INDOOR AIR QUALITYINDOOR AIR QUALITY

* ventilation:ventilation: fresh air and moisture control

COMBUSTION SAFETYCOMBUSTION SAFETY* back drafting: back drafting: sooting and combustion gases

TIGHTER BUILDINGS CHECKLISTTIGHTER BUILDINGS CHECKLISTTIGHTER BUILDINGS CHECKLIST


“A house is said to have poor Indoor Air Quality when the inside air contains enough of a substance to adversely affect thecomfort, health or safety of the occupants”

Generally speaking;


‘‘Natural draftNatural draft’’ water heater spillagewater heater spillage

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‘‘SEVERESEVERE’’ back drafting!back drafting!


‘Moisture’ sources in homesConstructionBathingCookingBreathingPlantsPetsLifestyle/hobbiesUnsealed sump pitsHumidifiersCombustion appliances

Some Some too wettoo wet, some too dry, some too dry


Bathroom issuesBathroom issues

moisturemoisture

odors odors

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MoistureMoisture or or temperaturetemperature problemproblem??


‘‘PollutantPollutant’’ sources in homessources in homesHygiene productsCleanersCookingSmokingPetsLifestyle/hobbiesUnsealed sump pits Attached garagesCombustion appliances ‘Every home will be different’


Bathroom sources: Bathroom sources: hygiene products/cleanershygiene products/cleaners

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Laundry room sources: Laundry room sources: cleaning products/softenerscleaning products/softeners


Basement sources: Basement sources: catch all for junk and moisturecatch all for junk and moisture


‘‘Ventilation strategiesVentilation strategies’’ & equipment& equipmentSpot exhaustSpot exhaust

Remote spot exhaust & multiRemote spot exhaust & multi--pointpoint

Balanced flow with Balanced flow with HeatHeat and/or and/or ENERGYENERGY recoveryrecovery

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Typical bath exhaust fan doing spot ventingTypical bath exhaust fan doing spot venting


Rated for wet location w/GFI protectionRated for wet location w/GFI protection-- mount in showermount in shower


Bathroom fan spot ventilation wall switchBathroom fan spot ventilation wall switch

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Typical bath exhaust fan doing double dutyTypical bath exhaust fan doing double duty**


Bath fan mounted in main part of homeBath fan mounted in main part of home


Acceptable whole building ventilation controlAcceptable whole building ventilation control

Mounted in the main part of home accessible to the owner. Wire in parallel with bathroom fan or remote spot fan doing double duty. (not 3-way operation)

Ventilation system

Many control options available- check with vendors

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Broan-Nutone model 744BroanBroan--NutoneNutone model 744model 744


Can lightCan light

44”” exhaust ductexhaust duct


Broan Broan ‘‘SmartSenseSmartSense’’Intelligent Ventilation systemIntelligent Ventilation system

Automates their Automates their QTXE QTXE 80/11080/110

cfm rated fanscfm rated fans

Uses house wiring to communicateUses house wiring to communicate

ASHRAE 62.2 readyASHRAE 62.2 ready

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66--inch connection allows for less restrictive ductinginch connection allows for less restrictive ducting


XX--1010 automation technology automation technology


Common house wiring is used !Common house wiring is used !

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PanasonicPanasonicAutomated fan

Low speed continuous

30-80 cfm

High speed boost

* 80 cfm

* motion sensor

* wall switch

* adjustable boost off time delay

* 1-60 minutes

ASHRAE 62.2 ready


80 CFM high speed w/variable continuous80 CFM high speed w/variable continuous


Occupancy sensor activation modelOccupancy sensor activation model

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Built in automation/controlsBuilt in automation/controls

Continuous Continuous CFMCFM speed controlspeed control

High speed High speed boost time delayboost time delay


The The ‘‘ULTIMATEULTIMATE’’

ManMan’’s fan!s fan!


Quiet remote inQuiet remote in--line fan combinationline fan combination

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Remote mounted exhaust ventilation systemRemote mounted exhaust ventilation system


Mounting issuesMounting issues


Dampers on each branchDampers on each branch

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Stack head mounted close to sourceStack head mounted close to source


Very low power draw by fanVery low power draw by fan


Stack headsStack heads can be used with most remote fans as well as with HRV/ERVHRV/ERV’’ss

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Very low power draw by CFLVery low power draw by CFL


Range hoods should be ducted to the outsideRange hoods should be ducted to the outside

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Venmar S31301LSVenmar S31301LS 2 speed range hood


CFLCFL’’ss will fit in cabinet!!


LowLow spee speedd power draw

High speedHigh speed power draw

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Remember:Remember:

1 CFM out = 1 CFM in

We know where the air is leaving, where does the air come in

Applied physics and building science

?Always comply Always comply wwiith th code lcode liimmiits fts foor r ddee--pressuripressurizatzatiioonn

DeDe--pressuripressurizzaatitionon con conccernernss wiwith exhath exhaust onust onllyy


Compact HRV/ERV whole house unitCompact HRV/ERV whole house unit--as small as 70 cfmas small as 70 cfm


Very low Very low power consumption!!

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Broan Broan ERVERV90HC: 90HC: side or top connections


BREEZE from RenewBREEZE from RenewAireAire


PrePre--filtersfilters

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‘‘DIRECT MOUNTDIRECT MOUNT’’ HRV or ERV now availableHRV or ERV now available-- no blowersno blowers


Control has both ASHRAE 62.2 or Control has both ASHRAE 62.2 or ‘‘%%’’ time run functionstime run functions


Tandem Tandem termination fitting & grille

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Exhaust air outExhaust air out

Fresh air inFresh air in


HRVHRV’’s and ERVs and ERV’’s have their own controlss have their own controls


Line voltage dual function controlLine voltage dual function control

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HRV or ERV function:HRV or ERV function: balanced flow with balanced flow with HEATHEAT and/or and/or MOISTUREMOISTURE recoveryrecovery

Stale air from houseStale air from house

Fresh air from outsideFresh air from outside

Stale air to outsideStale air to outside

Tempered air to houseTempered air to house


At this point we have only spent At this point we have only spent some MONEYsome MONEY!!

The only thing that matters is:The only thing that matters is:Does it work Does it work –– how wellhow well??

Did we meet our design goalsDid we meet our design goals??

yesyes//nono


Benefits

The ONLY way to know if your equipment is working

Learn what does and doesn’t work

Reduce callbacks

Create paper trail

Manage expectations

Airflow testingAirflow testing

# 1 problem: Very few people test anything

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All ventilation systems All ventilation systems must be testedmust be tested for flowfor flow


Poor ducting installationPoor ducting installation

# # 22 problem: NASTY restrictive ductworkproblem: NASTY restrictive ductwork

Exit grille here !


80 CFM fan 480 CFM fan 4’’ from outside grille:from outside grille:tested airflow: 31 cfm31 cfm for a whoppingwhopping 39%39%

of rated airflow

What was the What was the designdesign airflow ?airflow ?

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Installation problemsInstallation problems

All trades must be on the same page:All trades must be on the same page:crushed piping courtesy of siding/grille installer


Design airflow was Design airflow was 5050 cfmcfm

Removed excess ducting and retestedRemoved excess ducting and retestedNow have 6666 cfm or 83 %83 % of rated flow


Smooth bend radius over top plateSmooth bend radius over top plate

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Roof exit can work OKRoof exit can work OK


Always provide support for Always provide support for anyany flex pipingflex piping

Gable end terminationGable end termination


Testing tells all: case closedTesting tells all: case closed

Tested airflow from a Tested airflow from a 110110 cfm fan: cfm fan: OUCH !OUCH !

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Any problem with a little extra ?Any problem with a little extra ?

Soffitt guy doesnSoffitt guy doesn’’t do ductingt do ducting


# # 33 Problem; poor choice of termination grillesProblem; poor choice of termination grilles

Select low restriction typesSelect low restriction types


Readout from a Readout from a 110110 CFM rated fanCFM rated fan

57%57%

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Fitting design and manufacturing criticalFitting design and manufacturing critical

44”” fittingfitting


3 5/83 5/8”” actualactual

Know your componentsKnow your components


4141 cfm gain for a cfm gain for a 6565% improvement:% improvement:

95%95%

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Gable end fitting: very good flowGable end fitting: very good flow


Duct design issuesDuct design issues

May have to increase duct May have to increase duct ““diameterdiameter””

4 x 6 transition4 x 6 transition


150 cfm fan150 cfm fan:: 2626’’ ffrromom ou outtssidide:e:

testestted aed aiirflrfloow: w: 14140 cfm 0 cfm -- 9393%% ofof ra ratedted

Larger diameter Larger diameter ““foolsfools”” the fanthe fan

Support flexSupport flex--pipe on woodpipe on wood

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Seal ducting to exit grilleSeal ducting to exit grille

May be able to reduce back down to 4May be able to reduce back down to 4””


Good ducting & grilles are the keyGood ducting & grilles are the key!!

This puppy is This puppy is haulhaul’’in the mailin the mail


THANK YOUTHANK YOU

CONTACT INFO:

Joe Nagan – Home Building Technology Services

W804 County Trunk ZZ

Kaukauna, Wisconsin 54130

920-766-7578 office

920-427-5292 cell

[email protected]

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THANK YOUTHANK YOU


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What impact does this have ?What impact does this have ?

SoSome prme prograograms hms haave ave addooppted ted the nethe newestwest VentilatiVentilatioon Stann Standard: dard: AASSHRAHRAEE 62.2 62.2

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ASHRAE 62.2 ventilation requirementsASHRAE 62.2 ventilation requirementsWhole building ventilationWhole building ventilation-- per table 4.1aper table 4.1a

Spot ventilationSpot ventilation•• bathroomsbathrooms-- 50 cfm intermittent or 20 cfm continuous50 cfm intermittent or 20 cfm continuous

•• kitchenkitchen-- 100 cfm hood ducted to outside100 cfm hood ducted to outside


FLOORAREA (2ft)

BEDROOMS

0-1BEDROOMS

2-3BEDROOMS

4-5BEDROOMS

6-7 BEDROOMS

>7< 1500 30 45 60 75 90

1501-3000 45 60 75 90 1053001-4500 60 75 90 105 1204501-6000 75 90 105 120 1356001-7500 90 105 120 135 150

>7500 105 120 135 150 165

CONTINUOUS MINIMUM FLOWCONTINUOUS MINIMUM FLOW

TABLE 4.1a


Intermittent systems require a larger flow rate than continuous systems. The flow rate is related to the fractional on-time as noted in the following equation: Qf = Qr / (ef)where:

Qf = fan flow rate

Qr = flow requirement from table 4.1

e = ventilation effectiveness from table 4.2

f = fractional on-time

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Daily fractional on-time, f Ventilation effectiveness, e

< 35% 0.33

> 35% < 60% 0.50

> 60% < 80% 0.75

> 80% 1.0

Ventilation effectiveness for intermittent operating systems

TABLE 4.2


EXAMPLE:

A fan operated 30% of the time with cycle times of 4 hours ( six cycles per day) with a ventilation air requirement of 40 cfm will have a ventilation effectiveness of 30% ( from table 4.2). The fan flow will have to equal or exceed 404 cfm.

40 cfm / ( 0.33 x 0.30 ) = 404 cfm

* Suggest that you design for continuous operation to keep equipment smaller.


Popular equipment choices for whole Popular equipment choices for whole building ventilation/spot to satisfy building ventilation/spot to satisfy

ASHRAE 62.2ASHRAE 62.2exhaust fan mounted in main part of homeexhaust fan mounted in main part of home

remote mounted exhaust fan ducted to homeremote mounted exhaust fan ducted to home

small HRV or ERVsmall HRV or ERV

remote fan doing double dutyremote fan doing double duty**

exhaust fan mounted in a bathroom doing exhaust fan mounted in a bathroom doing double dutydouble duty**

range hoodrange hood

Equipment - overview

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*DISCLAIMERDISCLAIMER::

Any reference or comment about a particular product or brand is NOT TO BE construed as an endorsement of such

Products shown in this presentation represent only a ‘small sample’ of those available. Please visit your local distributor(s) for information on products available in your area

The author of and presenter of this material has NO FINANCIAL interest, or business ties with any product supplier or manufacturer

Opinions and comments presented are solely that of the author and presenter: Joe Nagan- HBTS



Stack head w/built in damperStack head w/built in damper

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Stack head w/built in pinStack head w/built in pin--type CFLtype CFL



Please visit and THANK all the Vendors!Please visit and THANK all the Vendors!

ask them about their completeask them about their complete product selectionproduct selection

observe all codes and applicable standardsobserve all codes and applicable standards

TEST every system: itTEST every system: it’’s in YOUR best interest!s in YOUR best interest!

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MultiMulti--point remote point remote exhaustexhaust


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Exhaust only, point sourceBath fans

Range hood vented outside (optional)

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Exhaust only, remote mountInline or multi-port fan


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Balanced with heat/energy recovery


Documents

National Weatherization Conference Ventilation Best .... Nagan... · Cooking. 9. Breathing. 9. Plants. 9. Pets. 9. ... ‘Ventilation strategies’ & equipment ... Stack head mounted