Air changes needed for healthy living

Minimum air changes per hour according to Building Regulations 1995 section F1.

2 changes -  bedrooms
3 changes – showers/bathrooms (F1 a fan capable of minimum extract capacity of 15 litres per second 54m³hr) lounge, hall, landing, toilets ( F1 plus a fan with 15 min over run) cellars
10 changes -  kitchens (F1 a fan  extracting 60 litres per second 216m³hr) laundry/utility room ( F1 a fan capable of extracting 30 litres per second 108m³hr)

Thus a 2 mtr x 4 mtr x 2.5 mtr bathroom needs 60 cubic metres per hour ventilation. That is a lot!

The table shows where most water vapour is created….little by sleeping but a lot by washing and cooking….regulations apply to new build but we should all be striving to upgrade our own homes….or live with must, black moulds and streaming windows every morning.