Building Regulations TGD Part F: Ventilation · 2019. 10. 18. · Building Regulations TGD Part F:...

© 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


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


What is Ventilation?

Ventilation:

The provision of fresh air to, and/or removal of stale air

from building spaces

Vs


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


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 Regulations – TGD Part F Ventilation

Applies to

dwellings

commencing 1st

November 2019


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


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


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


Part F Ventilation 2019 – Ventilation

Systems

Natural Ventilation:


Continuous Extract Ventilation:


Mechanical Ventilation with Heat Recovery


( 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:


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


Other Design Considerations

• Air Transfer within the dwelling

• System noise

• Ducting routes

• Installation sequencing


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


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


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


Documentation for assigned certifier:

Part 1 – 3 completed by installer

Part 4 - completed by accredited 3rd party










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


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


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


Test Equipment

• Balanced Flowmeters (Powered

Hoods)

• Vane Anemometers add pressure to

system and do not give accurate

system flow rates

• Calibrated yearly






Common Problems which lead to

reduced flow rates


Common issues due to poor

ventilation• Poor Indoor Air Quality

• Damp & Condensation Problems:


Thank You

Any Questions?

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