Part F, England
Ventilation rate calculator
Find the minimum ventilation rates for a home in England in a few seconds.
This calculator uses the minimum rates in Approved Document F, Volume 1 (2021 edition), which applies to homes in England. Enter the home and it works out the whole-dwelling ventilation rate and the extract rates for intermittent fans.
Results
Whole-dwelling ventilation rate
31 l/s
Total intermittent extract (fans running on boost)
81 l/s
How the numbers work
- Whole-dwelling rate: 19 l/s for one bedroom, 25 for two, 31 for three, 37 for four and 43 for five, adding 6 l/s for each extra bedroom. It must also be at least 0.3 l/s per square metre of internal floor area, and the higher figure applies.
- Intermittent extract: 30 l/s for a kitchen cooker hood that extracts outside, or 60 l/s for any other kitchen fan; 30 l/s for a utility room; 15 l/s for a bathroom; 6 l/s for a WC.
- Continuous systems such as dMEV and MVHR use different, lower continuous rates with a higher boost rate, and the whole system is commissioned against the design.
This is a quick check, not a design. Wales has its own Approved Document F, and Scotland and Northern Ireland use different rules. A ventilation designer confirms the rates for your home and the commissioning results are what building control checks.
Sources
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