... 3.Longlife ball bearing motor Bathroom fan with light and heater BPT10-50HLModel: BPT10-50HL50CFM,85m3/h,2.0sones,38db,4"Duct,Power ... unity,very comfortable.2.High-efficiency heating element,with over-heat protection device,safe and reliable,long life.3.Enclosed housing design ... &frequency:120V,60Hz,220V/230V,50Hz,CFM:50CFM(85m3/h),suitable for 45-65Sq.Ft. Bathroom fan with light and heater BPT10-50HL