Ventilation: Approved Document F, Volume 2 — Buildings other than dwellings

O N L I N E V E R S I O N B Appendix B: Performance-based ventilation Introduction B1 This appendix sets out the levels of moisture and other pollutants that the provisions in this approved document are designed to control. The provisions are designed to control all of the following. a. Bio-effluents, as described in paragraph B2a. b. Moisture levels, as described in paragraph B2b. c. Indoor air pollutants, as described in paragraph B2d. NOTE: The guidance in this approved document may not be adequate to address pollutants from flueless combustion space heaters. This approved document does not directly address contamination from outdoor sources. NOTE: A strategy for achieving good indoor air quality includes reducing the release of water vapour and air pollutants. This approved document does not provide guidance on such strategies. Performance criteria for buildings other than dwellings B2 The main guidance within this approved document focuses on offices. The main performance criteria applied are as follows. a. There should be a supply rate, in the absence of tobacco smoke or other excessive pollutants, of 10 litres per second per person. This will also satisfy the requirement of 8 litres per second per person needed to control higher levels of bio-effluents. b. There should be no visible mould on the inner surfaces of external walls of a properly heated building with typical moisture generation. c. Mould can grow whether the building is occupied or unoccupied, so the performance criteria for surface water activity (as given in Table B2) should be met at all times, regardless of whether there are occupants. The other pollutants listed in Table B1 are only of concern when the building is occupied. d. The performance criteria for indoor air pollutants are given in Table B1. 27 Building Regulations 2010 Approved Document F Volume 2, 2021 edition O N L I N E V E R S I O N