Replaces OEM part number: A163. Fasco: 7021-10721, 7021-9450, 7021-10302, 7021-10893, 7121-10721, 7121-10893, 7121-9450, 7121-9450E. Used for: Inducing the draft (pulling air) into the furnace’s combustion chamber and venting the exhaust gases out of the flue.
