The smoke eshaust fans have succeed to the fire test as class time-temperature F400 according to law EN 12101 of 3rd June 2002. The fans can be settled in internal areas that are subjected to fire and they can be used with environment air for 2 hours at maximum temperature of 400 degrees. The certificated range fans are built with long casing, made of painted carbon steel, die-casting aluminium airfoil impeller, with diameter from 400 mm to 1400 mm. The certificated equipment available together with the fan are the flexible connections, the protection nets, the BA inlet cones, the support feet and the spring vibration dampers.