This Combustion fan is the correct replacement for all HARMAN Freestanding stoves, inserts, furnaces, and boilers (PELLET/CORN). It replaces factory part #3-21-08639 Note: Earlier Harman stoves had a fan on the rear side of this motor with a black plastic cover; this is no longer being used, this is the correct replacement. Replacement consists of removing the back plate from the housing. The entire housing itself does not need to be removed. Replacement of the gasket between the plate and the housing is recommended. The old fan blade can be removed and reused by sliding it from the shaft and placing it on the new motor. Black and white wires connect directly to the unit, while the green wire is the ground.