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

A O N L I N E V E R S I O N Sanitary accommodation A space containing one Ventilation opening Any means of purpose- or more flush toilets (WCs) or urinals. Sanitary provided ventilation (whether permanent or accommodation containing one or more cubicles closable) that opens directly to external air, such counts as one space if there is free circulation of as the openable parts of a window, a louvre or a air throughout the space. background ventilator. It also includes any door that opens directly to external air. Shared communal rooms Rooms in buildings containing dwellings, which provide facilities Whole building ventilation (general ventilation) for the residents, for example a laundry room, Nominally continuous ventilation of rooms or occupied lobby or gym. This does not include spaces at a relatively low rate to dilute and remove areas used solely or principally for circulation in pollutants and water vapour not removed by buildings containing dwellings, including corridors extract ventilation, purge ventilation or infiltration, or lift lobbies. as well as to supply outdoor air into the building. Surface water activity A measure of the availability of water to micro-organisms. Surface water activity is determined from the ratio of the vapour pressure of the water in the substrate to the vapour pressure of pure water at the same temperature and pressure. This ratio, in steady- state conditions, is numerically equal to the equilibrium relative humidity of the air, except that the latter is commonly expressed as a percentage. Thermal envelope The combination of thermal elements of a building which enclose a particular conditioned indoor space or groups of indoor spaces. Utility room A room containing a sink or other feature or equipment that may reasonably be expected to produce significant quantities of water vapour. Ventilation The supply and removal of air (by natural and/or mechanical means) to and from a space or spaces in a building. It normally comprises a combination of purpose-provided ventilation and infiltration. 26 Approved Document F Volume 2, 2021 edition Building Regulations 2010 O N L I N E V E R S I O N