So now we take the fan or air booster which is already anchored inside duct work already by the factory..perfect!...............so now we cut the end off the exstention cord and keep the pronge side of the cord!.......hook the wires up to the fan,if you notice the fan has 3 wire's thats why I said further up that you needed a 3 pronge exstension cord......in this case green wire on both exstension cord and air booster are both ground wire's......and the 2 remaining black wires on the fan can be hooked up to the exstention cord either way! doesn't matter......just make sure the green wire on the air booster is the ground wire that hooks up to the exstenion cords green wire can't go wrong really lol...........