The fan motors operate in the suction mode and prevent the condensate forming on the fan. The coil is made of aluminium fins (fin spacing 5,3 mm) and 3/8” copper tube. It is tested with nitrogen / helium at a pressure of 25 bar. The fan motor models in use have the following features: Manufactured following EN 60335-1 laws, with internal thermal protection. Fan diameter 250mm, 28° inclination. Power supply 230-240V/1/50-60Hz. IP42 protection rate. Operating temperature from -40°C to +40°C. B insulation class. Electrics made in conformity with 2006/95/CE. Low Tension directive. The housing is made of aluminium. The manufacturing solutions used give the housing strength and guarantee the absence of vibrations during the functioning. Screws, washers and nuts are made of stainless steel.