With the newer direct drive fans on grease exhaust systems that do not have belts to service, many technicians are not checking inside the motor housings. That is a mistake as the open style motors can plug up and overheat. That can lead to numerous other issues and possible a grease exhaust fire. We do not recommend using open style motors on grease exhaust fans. Always choose an enclosed motor (TEFC) and where possible, move the VFD's (controls) away from the fan and inside the building. This keeps them away from the weather. See picture of a plugged up fan motor that overheated.
