For galley, head, or engine compartment ventilation. Tunnel design places the motor in the center of the air flow for cooler operations Ignition protected and NMMA approved as well as meeting USCG Safety Standards. Housing is molded of tough, corrosion proof ABS plastic One piece molded plastic impeller provides balanced, vibration free performance Compact and easy to install Inlet: 4" Outlet: 4" 233 CFM 12 VDC