OEM Lennox Power Exhaust Fan Motor — 44L91

The genuine OEM Lennox 44L91 power exhaust fan motor drives the venting assembly that clears combustion byproducts from your furnace or rooftop unit. By actively pushing flue gases out through the exhaust, it ensures safe, code-compliant venting and maintains the draft the burner needs for clean, efficient combustion. It is a safety-critical component, not just a comfort part.

Common failure symptoms include a motor that hums but won't spin, noisy or grinding bearings, intermittent starting, or a unit that locks out on a pressure-switch or draft-proving fault because exhaust airflow has dropped. You may also notice the furnace short-cycling or failing to fire, since many systems will not allow ignition until the power exhaust proves proper venting.

Why OEM matters: the 44L91 is matched to your Lennox unit's voltage, speed, rotation, mounting, and airflow requirements, so it develops the exact draft the pressure switch and control board expect. A generic motor with the wrong RPM or airflow can trip safety switches, vent improperly, or fail prematurely under the demands of continuous exhaust duty. Choosing the factory part keeps venting safe and reliable. In stock and ships same day when ordered before 3PM CST.