Retrotec manufactures blower doors (or door fans) that are used in over 40 countries to measure the leakage rate of buildings, houses, rooms, ductwork and other enclosures. Plug the leakage results into Retrotec's Windows software to calculate energy loss, ventilation rates, smoke control and fire suppressant loss rates according to the following standards: Enclosure Integrity Tests using: * NFPA 2001 * ISO 14520 Energy Loss Tests using: * EN13829 * British CIBSE TM23 * Canadian CGSB 149.10 * American ASTM E779 * Europe CEN/TC * Japanese standard * Dutch NEN 2686 * SuperE * Title 24 Smoke and Refuge using: * PFEER * 1994 Uniform Building Code Section 905