I am a newbie to electrics so please be patient. My edf has 3 black wires coming out of it. They are labelled A, B, and C. My motor has a blue wire, yellow wire and red wire. Which wire connects to which? Also, the fan unit slides nicely into the forward duct tube. Is this enough to hold it in place, or do i have build a support to screw down the tabs on the side of the fan housing? Do i glue the fan into the duct?