4in Inline Bilge Air Blower DC12V 235CFM High Air Flow Electric Marine In Line Fan for RVs Boats Yachts Item Type: Air Blower Material: ABS shell, copper motor core Air Flow: 235CFM Working Voltage: DC12V Fuse: 7A Current: 4 Amps Size: Approx. 4inch/102mm Fitment: Suitable for RVs, boats, yachts, ideal for bilge, engine rooms, aisles and canopies Installation: 1. Install the fan with two M6 screws in the upper part of the bilge, power room, kitchen and toilet. When fixing the screws, the screws should not be over tightened to prevent penetration through the chassis. 2. The fan should be moderately inclined when installed, which is convenient to prevent rain erosion. The direction of the arrow is the exhaust port (the correct airflow direction must be confirmed before installation). 3. Fix the diameter (235CFM-4 inch) inlet and outlet conduit with stainless steel pipe buckle. 4. The intake duct should be permanently installed and fixed above the bilge plane and properly located under the engine. Connection: 1. Brown is the positive electrode, black is the negative electrode, use crimp contact joint. The joint uses a sealant to resist water. 2. The positive electrode must be connected to the fuse 3. The positive pole must be connected to a disconnect or connection switch with the same power as the fuse. 4. The minimum wire diameter is 16AWG .