of the industry in several areas: Energy efficiency Environment friendliness Service friendliness. 1 Reduced energy consumption More air, less power consumption. 2 IP 54 protection Closed frame prevents [...] Filterfans 4.0™ comply with national and international standards e. g. TÜV, NEMA, cURus, EAC, CSA, CE. 1 Reduced energy consumption 2 IP 54 protection 3 Patented 4-corner fastening system 4 Unrivalled airflow [...] optimise the airflow characteristics of the rotor blades and fins in the housing covers. After more than 1,000 tests in our own climate chambers, the design was ready for market launch. In addition to maximum