PRF 200D2 IE3. The PRF fans are equipped with high efficient IE2 motors. The PRF fans have been developed especially for the exhaust of aggressive media. This is the right fan when corrosive gases, contaminated air or other aggressive components are part of the exhaust air. Typical applications are medical facilities, the food-, electrical-or chemical industry. Speed control is only possible by using a frequency converter. Motor protection is done by cold conductors (PTC), which have to be connected to an external motor protection device. The sintered casing is from UV-resistant PE and offers a variety of applications with its connectors from