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BSRIA testing ventilation for Part J revisions for CLGDecember 2009

BSRIA testing ventilation for combustion in air tight homes for 
Part J revisions 
on behalf of CLG

As part of the proposed revision of Part J and its associated guidance, CLG has contracted BSRIA to carry out an experimental study to test the assumptions regarding the sufficiency of adventitious permanent ventilation for combustion of open flue appliances in air tight homes.

Requirement J1 of the Building Regulations requires that combustion appliances are so installed that there is an adequate supply of air to them for combustion. Approved Document J gives guidance on minimum standards for permanent ventilation openings taking into account assumptions about the amount of "adventitious" ventilation that occurs through leaks in the building fabric. These assumptions may no longer be valid for properties built to the current requirements nor if air tightness requirements are further increased.

BSRIA's research and testing

The purpose of the BSRIA study is to provide an evidence base to allow CLG and BRAC to consider the options for amending the guidance with respect to the provision of permanent ventilation for combustion of open flue appliances under the Building Regulations.  The main objectives of the BSRIA's work are to:

  • Make initial recommendations from a desk based study to be incorporated into a wider public consultation on proposed changes to Part J
  • Test the assumptions regarding the sufficiency of adventitious permanent ventilation for combustion of open flue appliances
  • Advise on any comments received in response to the public consultation.  Produce a series of recommendations for possible amendments to Part J for consideration by CLG

BSRIA carried out testing at it's laboratory in Bracknell in a room mock-up with real commercial appliances taking into consideration different types of fuel, building characteristics and construction methods, the influence of pressure differences and wind speeds.

The final results of the BSRIA's findongs will be published soon.

BSRIA is also a part of the Secretariat of the Part J working group with a specific task of consolidating views of the working group and the consultation responses for the purpose of the amendments to Part J.

Contact BSRIA Test & MicroClimate:

Email test@bsria.co.uk 


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