Is your Harman or Heatilator pellet stove insert not venting properly or making weird noises? The combustion blower motor might be worn out. This replacement motor from Pellethead is designed to fit a variety of models, matching part numbers like 3-21-08415 and 3-21-08639. This motor is crucial – it pulls air through the firebox and pushes exhaust out the vent. A new one will restore proper draft and efficient burning. It's brand new, comes as a single unit, and is a common repair part for pellet stove owners. Get your cozy fireplace back in working order and avoid potential shutdowns with this reliable replacement motor.