Under building regulations you will find that the volume of air contained within the building is required to be completely replaced every 15 – 30 minutes. Ventilation flow rate, air exchange rate all sorts of rates led to confuse. Vent Axia provide a simple table that make a complicated subject fairly simple –

Vent Axia Design Document

You can also go to for technical stuff. This inevitably requires the installation of extractor fans, louvres in doors and pipe works in the roofing space and designed by experts.

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