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© Building Envelope Technologies Ltd 2011
Building Regulations
TGD Part F: Ventilation
Event: CMG Events: BCAR & TGDS: Key Issues to Date
DATE: 17/10/2019
Presented By
Terry Kavanagh MIEI B. Eng. (Hons.) Building Services
Building Envelope Technologies Ltd.BUILDING PERFORMANCE & COMPLIANCE EXPERTS
© Building Envelope Technologies Ltd 2011
Contents
Ventilation – What and Why?
Building Regulations TGD Part F:• Key Changes to TGD Part F 2019
• Ventilation in other Technical Guidance Documents
• Defined Ventilation Systems
• System Designer
• System Installer
• Ventilation Performance Testing
Ventilation – Common Issues
© Building Envelope Technologies Ltd 2011
What is Ventilation?
Ventilation:
The provision of fresh air to, and/or removal of stale air
from building spaces
Vs
© Building Envelope Technologies Ltd 2011
Ventilation v. Infiltration
Ventilation:
Is the controlled flow of outside air into a building- Openable windows, wall & window vents, extract fans, heat recovery ventilation, passive stack vents, AHU’s
Infiltration:
Is the uncontrolled flow of outside air into a building- Driven mainly by wind and the stack effect through unintended gaps and cracks in the building envelope
Vs
© Building Envelope Technologies Ltd 2011
Why Ventilate?
To provide a healthy and comfortable internal environment
for the building’s occupants.
To remove polluted indoor air from a building and replace it
with ‘fresh’ outside air:
• Moisture e.g. from washing, cooking.
• Carbon monoxide (CO) and oxides of nitrogen e.g. from combustion appliances, smoking.
• Volatile organic compounds (VOCs), e.g. from aerosols and formaldehyde found in some
furniture.
• Allergens e.g. from house dust mites.
• CO2 e.g. from humans and also combustion appliances.
• Odours e.g. from cooking, bodies and pets.
Provide air for open flued combustion devices (TGD PART J)
To help control overheating (TGD PART L)
© Building Envelope Technologies Ltd 2011
Building Regulations – TGD Part F Ventilation
Applies to
dwellings
commencing 1st
November 2019
© Building Envelope Technologies Ltd 2011
Building Regulations – Ventilation in other
Technical Guidance Documents
TGD Part L Conservation of Fuel & Energy:
• Minimise air infiltration and provide purpose built ventilation
• Ventilate while minimising energy use and discomfort
• To help control overheating
TGD Part J Heat Producing Appliances:
• Provide air for open flued combustion devices
• Fans and room open combustion appliances should be able to operate
independently of each other
TGD Part B Fire Safety:
• Ductwork passing through fire compartments
• Issue with air transfer and fire doors
© Building Envelope Technologies Ltd 2011
Key Changes to TGD Part F 2019
• Regulations updated and clarified – roles and systems
defined
• Buildings with air permeability below 3 m3/hr/m2 need
mechanical ventilation system
• Introduction of certified installer scheme
• Introduction of installation commissioning verification
scheme
• Additional mechanical ventilation installation &
commissioning guidance document released
© Building Envelope Technologies Ltd 2011
Key Roles Defined:Designer:
‘Ventilation systems should be designed by competent
designers.’
Installer:
‘Systems should be installed, balanced and commissioned by
competent installers’
-competent person scheme
Independent Inspector:
‘Systems when commissioned and balanced should then be
validated to ensure that they achieve the design flow rates by
an independent competent person’
-INAB accredited or equivalent
© Building Envelope Technologies Ltd 2011
Part F Ventilation 2019 – Ventilation
Systems
Natural Ventilation:
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Continuous Extract Ventilation:
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Mechanical Ventilation with Heat Recovery
© Building Envelope Technologies Ltd 2011
( The airtightness test )
Issue: TGD Part F & TGD Part L Air Permeability
New TGD Part L 2019 reduces airtightness backstop to 5 m3/hr/m2 – all units
to be tested - Below 3 m3/hr/m2: mechanical ventilation required
Natural ventilation with intermittent fans:
© Building Envelope Technologies Ltd 2011
Mechanical Ventilation Calculated General
Flow Rate
• Minimum Flow is greater of:
5 l/s plus 4 l/s per person
Or
0.3 l/s per m2
• Boost should increase by 25%
• Supply and return on Heat Recovery System
should be balanced
© Building Envelope Technologies Ltd 2011
Other Design Considerations
• Air Transfer within the dwelling
• System noise
• Ducting routes
• Installation sequencing
© Building Envelope Technologies Ltd 2011
Information Flow to Site
Installers will need clear drawings,
instruction and guidance in order to
reproduce design intent & meet flow
rates
Inspector will need designers
flowrates in order to validate system
© Building Envelope Technologies Ltd 2011
Trained and accredited installers
Detailed guidance given in supplementary document
“Installation and Commissioning of Ventilation
Systems for Dwellings - Achieving Compliance with
Part F 2019”
Installation
© Building Envelope Technologies Ltd 2011
Operation and maintenance manual
The operation and maintenance information for the ventilation
system should be handed over to the building owner on
completion and should contain:
• Specific instructions for the end user on how and when to
use the ventilation system
• Information should also be provided to suggest when the
system components should be cleaned and maintained.
Completion checklist and commissioning sheet
The three-part sheet detailed in Section 6 should be signed,
completed, and included in the operation and maintenance
manual.
Installer: System Completion &
Handover
© Building Envelope Technologies Ltd 2011
Documentation for assigned certifier:
Part 1 – 3 completed by installer
Part 4 - completed by accredited 3rd party
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Independent Inspection
• 3rd Party gives confirmation that specification
has been achieved
• To identify any problem areas
• INAB Accredited to Test Standard EN ISO
14134:2004 – Ventilation for Buildings –
Performance Testing & Installation Checks of
Residential Ventilation Systems
© Building Envelope Technologies Ltd 2011
Independent Inspection - Why?
Characteristics and performance of MVHR systems - A
meta study of MVHR systems used in the Innovate UK
Building Performance Evaluation Programme
Study Measured Airflows in 54 Properties and found:
Only 70% of dwellings had reported to have been
commissioned
Only 50% of those ‘commissioned’ were fully
commissioned
Of the 38, only 16% met UK Part F minimum flow rates
© Building Envelope Technologies Ltd 2011
Independent Inspection - Why?Characteristics and performance of MVHR systems - A meta study of MVHR systems
used in the Innovate UK Building Performance Evaluation Programme
www.betechnologies.ie© Building Envelope Technologies Ltd 2007
Test Procedure:
• Set all ventilators to intended position
• Measure conditions
• Close all windows and doors
• Measure flowrate at each
terminal and record against
design values -note location
of reading on drawing
• Repeat for boost function
© Building Envelope Technologies Ltd 2011
Test Equipment
• Balanced Flowmeters (Powered
Hoods)
• Vane Anemometers add pressure to
system and do not give accurate
system flow rates
• Calibrated yearly
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Common Problems which lead to
reduced flow rates
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Common issues due to poor
ventilation• Poor Indoor Air Quality
• Damp & Condensation Problems:
© Building Envelope Technologies Ltd 2011
Thank You
Any Questions?