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Room	Minimum intermittent extract rate	Continuous extract	听
听	听	Minimum high rate	Minimum low rate
Kitchen	30 l/s (adjacent to hob); or 60 l/s (elsewhere)	20 l/s	Total extract rate must be at least the whole building ventilation rate in Table 2
Utility room	30 l/s	8 l/s	听
Bathroom	15 l/s	8 l/s	听
Sanitary accommodation	6 l/s	听	听

听	Number of bedrooms in dwelling	听	听	听	听
听	1	2	3	4	5
Whole building ventilation ratea (l/s)	13	17	21	25	29
听	Minimum value in any dwelling of 0.3 l/s per m2 internal floor area b
a) This is based on two occupants in the main bedroom and a single occupant in all other bedrooms. For greater level of occupancy add 4 l/s per occupant.
b) This includes each floor e.g. for a two storey building, add the ground and first floor areas.
*Note: this article was prepared by reference to the most recently available draft of AD F released by the ODPM last year.