An air leakage test is a test to determine the level of uncontrolled air flow through gaps or cracks in the fabric of a building. The result of the air leakage test is expressed as a quantity of air leakage (m3 per hour) per square metre of the building envelope. For reliable air pressure testing services throughout London and the local surrounding areas, get in touch with Air Tightness Assessors today for more information. Not found what you’re looking for? We also specialise in extractor fan testing plus more!