The Quiet Zone Bathroom Fans feature a ball bearing, permanent split Capacitor (PSC) motor with an aerodynamic blower wheel and an attractive sleek flush grille. Lower RPM's for Lower Sones. Housing Rugged corrosion resistant 26 gauge galvanized steel. Detachable 4 duct collar with built-in draft damper. Adjustable double hanger mounting brackets. Up to 24 inches for ideal positioning. Motor Plug in permanently lubricated motor engineered for continuous operation. Exceeds Energy Star parameters. ball bearings are standard. Permanent Split capacitor (PSC) motor with automatic thermal overload (110 volts 60 hz). ETL and cETL listed for tub / shower when used with GFCI branch circuit. Features: Type: Ventilation Fan. Quiet Zone Ceiling Mount Bathroom Ventilation Fan. Ball Bearing Permanent Split Capacitor (PSC) Motor. By ACME Miami. Specifications: Duct Diameter: 6. Air Volume: 153 CFM. Noise Level: 1.1 Sones. Power Usage: 35 Watts. Power Rating (V/Hz): 120/60. Dimensions: 14 (L) x 13 (W).