OEM Lennox Draft Inducer Blower Motor — 78F91
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The genuine OEM Lennox 78F91 draft inducer blower motor drives the inducer fan that pulls combustion gases through the heat exchanger and safely vents them out of the flue before and during furnace ignition. This pre-purge airflow is essential for the pressure switch to close and allow the ignition sequence to begin, making the inducer a critical safety component in your Lennox furnace.
Common failure symptoms: the furnace won't ignite and locks out, a loud humming, grinding, or rattling from the inducer housing at startup, a pressure switch fault code, short cycling, or no heat at all. Worn bearings and seized motors are frequent culprits, and a failing inducer will often prevent the furnace from firing entirely as a built-in safety measure.
Why OEM matters: the 78F91 is engineered to deliver the exact RPM, torque, and airflow (CFM) your Lennox heat exchanger and pressure switch are calibrated for. A generic motor can create improper draft, trip the pressure switch, or allow dangerous flue-gas conditions. The factory OEM part ensures safe combustion venting, correct pressure-switch operation, and a reliable bolt-in fit.
Shipping Information
- Orders placed before 3PM CST ship same business day
- Standard delivery: 2-5 business days
- Express shipping available at checkout
- Free shipping on orders over $75
- Tracking number emailed upon shipment
Return Policy
- 30-day returns on unused parts in original packaging
- Electrical parts (capacitors, contactors, control boards) are final sale once installed
- Email info@nationalhvacparts.com to initiate a return
- Refunds processed within 5-7 business days