This Detroit Marine Tunnel Blower has a design which places the motor in the center of the air flow for cooler operation which results in a lower amp draw. The vanes inside the blower housing direct the air for decreasing turbulence and increased efficiency and output. This is BIA approved and rated and meet U.S. Coast Guard safety standards. A rigged one piece molded Delrin plastic impeller provides balanced, vibration free performance. The blower housing is molded of tough, corrosion proof, ABS plastic. There are special clips on hose flanges which eliminate the need for hose clamps. The blower may be mounted in a remote location. It is 8-1/2 in. long, 5-1/2 in. wide, and opening is 3 in.. It uses a built-in mounting bracket, transom, deck mounting vent or deck mounting flange.