As air tightness of buildings moves ever closer to zero permeability, CLG have recognised the fact that continuous mechanical ventilation is going to become more and more necessary to maintain internal air quality and avoid the onset of mould growth.  They have also recognised that, where systems are already installed, occupiers will turn them off if they are too noisy.  In an attempt to avoid this situation, the proposed Part F (2010) includes noise emission limits for continuously running ventilation systems. 

The proposal is for type testing whereby all domestic ventilation systems for use in domestic buildings will need to be tested Tests in accordance with the appropriate part of BS EN 13141 to establish the system sound power levels.  Sound power figures rather than sound pressure will be required, because this is a measure of the total noise energy radiated by the device in all directions and is essentially independent of the measuring environment. 

Since absolute noise levels can be a very subjective measure, there is also an additional limit set for the avoidance of “prominent acoustic tones”.  The proposed performance standards are detailed in Appendix E, Table E1 of the technical guidance for Part F.

CLG have made it clear that this is very much new territory and they welcome feedback on both the limits set and the implications for manufacturers. 

Copies of the proposed documents for Building Regulations Part L and Part F (2010) and details on how to submit feedback on the proposed changes can be found on the CLG website.  The consultation closes on the 17 September 2009.

CLG Website 

For a downloadable version click here.