This is a high quality aftermarket motor only for the Invincible and Accentra Pellet Inserts and the Harman Magnum Coal Stoker. For the Invincible Insert and Accentra Insert, only the motor and fan will fit into the insert as the original housing is welded in. This entire assembly can be replaced on the Harman Coal Stokers. The replacement blowers for the Super Magnum Stoker, Invincible, and Accentra pellet inserts are now one-speed blowers. Previously these replacement blowers were three-speed with two speeds made inactive. (Red and Blue not connected) All production models beginning with serial number 008600509 for the Super Magnum Stoker and serial number 008248445 for the Accentra pellet insert have been changed to the one-speed blower. This new wiring is invisible to the consumer since it still only operates at one speed like it always had. Installation requires two (2) 1/4 female wire terminals (not included) to be crimped to the wire leads at the time of installation. Our old part number 12189-M. If the serial number on your Harman Invincible Insert falls between serial number 1556 – 2128, this blower is not compatible with your stove. During that time Harman was using part number 3-21-08619. This part is now obsolete. Replacement For Part Number. 115V, 60Hz, 1.05A, 1500RMP, 180CFM, 1/4 female spade terminals. Invincible Insert (2128 – 1556). Assembly Instructions for 3-21-47120. Access to these motors can be tricky as they are located under the unit itself se diagrams below. Locate the wiring disconnects and separate the connections for the motor. Remove the three mounting screws and remove the blower. If you are doing a motor only replacement, remove the squirrel cage blower fan and attach it to the new motor. Insert new motor and secure with old hardware. If your blower requires new wire terminals, attach those to the stripped section of wire. Connect your wires black to black and white to white. Secure the wires from dangling with zip ties. Listing and template services provided by inkFrog.