Blower Door Air Tightness Testing is the process of determining the amount of air leaking from inside (heated air in winter or cold air in summer) to outside (waste of money). The test method itself is straightforward. We install a fan into a doorway of the building and draw air through the fan out of the property to create a negative pressure inside the house. Because we are measuring how much air is going through the fan, we can calculate how much air is escaping and therefore determine the house leakage rate i.e. the number of air changes per hour.
Air leakages are with a thermal camera.