3 vent holes under the deck need to be connected w/ 3" vent hose & simply pushed into 3 of the floor holes to allow outside air to enter the bilge, the other holes are for steering cable & wiring. The bilge blower or its suction hose must originate from the lower 1/3 of the bilge, so as long as you floow that you can place it where you want, the newer models had the blower mounted between the exh. suspended from a piece of aluminium flat bar.