The Air Tightness Testing & Measurement Association is a company limited by guarantee, owned and operated by its members. It is also a MHCLG-appointed operator of a “Competent Persons Scheme” for air-tightness testing. Independent and impartial, supporting more than 500 tester members responsible for 86% of all tests Lodged in the UK, driving quality and better testing throughout the industry, assuring competence, confidence and integrity for every single test undertaken by its members.”