Ventilation Commissioning Certificate

In a new home, yes: regulation 42 of the Building Regulations requires the airflow rates to be tested and the results given to building control within five days of the final test. Approved Document F Section 4 sets out how, and asks for mechanical ventilation fitted in existing homes to be commissioned and recorded in the same way.

For intermittent extract fans, Approved Document F Table 1.1 sets a kitchen at 30 l/s with a cooker hood that extracts outside or 60 l/s otherwise, a utility room at 30 l/s, a bathroom at 15 l/s and a WC at 6 l/s. For continuous extract, Table 1.2 sets the high rate at 13 l/s for a kitchen, 8 l/s for a utility room or bathroom and 6 l/s for a WC. The whole-dwelling rate depends on floor area and the number of bedrooms (paragraph 1.24).