Bath fan BPT18-02BL 1.70CFM. 2.Longlife ball bearing motor. 3.Quiet and high quality. 4.Certification:UL,CCC. ... , 2.5sones, 57db,4"Duct,Power:45W1).70CFM.2).Longlife ball bearing motor.3).Quiet and high quality.4).Certification:UL,CCC ... powder coating,resistance to rusting and corrosion.4.High quality ball bearing motor,apply low power consumption,low temperature-rising,environmental,over ...