Air permeability testing, also known as air testing, air tightness testing or air pressure testing is part of your building energy audit and will give you a clearer idea of how your building performs as well as how you can improve it. There are many benefits to having an airtight building, including a reduction in energy bills and a reduced carbon footprint. It also helps to reduce condensation problems that can occur in a building. In addition, it helps to ensure that your building will meet the standards set out by the UK Building Regulations.