The fan housing is made of double skin panel of high quality pre-painted sheet metal that is resistant to corrosion, the panel is filled with polyurethane foam insulation material with total panel thickness 25 mm for small capacity fans and 45 mm for high-capacity fans. Carcass structure is made of hygienic aluminum profile. Asynchronous motor belt & pulley drive system is used. The fan section system is provided with filters and louvers. The device is capable of handling air at max. 60 °C.