As noted earlier, proper suction pressure is key in the operation of a furnace fan. Wires Coming from Original Furnace. Last, you'll want to make sure this motor can operate using volts, which will be indicated on the motor. This is one of the key aspects you'll need to understand when constructing your fan. In order to divert the wall socket power supply to the motor you will need a wall plug. Hello, and welcome to Stack Exchange.
Follow these instructions to install a furnace blower motor capacitor.
How to Install a Furnace Blower Motor Capacitator