Basement venting facility requirements

Venting facilities, connected directly to the external air, should be provided from every basement storey other than – (a) a basement in a building of Purpose Group 1(b) or (c); (b) a basement storey which – (i) has a floor area not more than 200 m²; or (ii) has a floor not more than 3 m below the lowest adjacent ground level; (c) a basement storey used for car parking and ventilated in accordance with paragraph 4.50; and (d) a basement storey or that part of a basement storey used as a strong room.