1)YWF400sucking and blowing,920/1380rpm,4/6 poles 2)heater,condensor,freezer,exhaust fan,evaporator,air cooler 3)UL,CEapproval ... chiller, condensing unit, central air-conditioning and heater, etc.3. The insulation class of motor is F or B, and the protection ... enterprise, research& technology center... UL approval ac ball bearings electric motor for heater,freezer room