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What is Air Permeability Testing?
Air Permeability testing is a means to quantify the extent to which buildings 'leak' air through their envelopes (for example cracks/holes in perimeter walls, roof and floor slab). Too much air leakage can lead to substantial heat loss; resulting in higher CO2 emissions, increased heating bills and uncomfortable drafts. It has nothing to do with building ventilation, which is the controlled flow of air in and out of the building via extractors and trickle vents etc.
The actual air pressure test requires a large fan to be mounted in an external door opening of the dwelling and then the building is usually de-pressurised to create subsequent pressure differentials between the internal and external environment of the dwelling. It is this differential that’s monitored to find out how air tight the building is.