This is turbo in-line blower. It is designed with 5 fan blades based on fluid dynamics, high efficient motor, and durability. This provide ventilation for bilges, engine compartments, galleys, and heads. Material: Abs. Size: Around 4". Hose diameter draw 4a/ 12vdc 330 cfm 18 gauge wires 6a fuse item: P13220wh.