A direct replacement draft inducer blower motor engineered to fit specific Fasco and Lennox furnace models. This permanent split capacitor motor delivers reliable combustion air exhaust performance with thermally protected windings, Class B insulation, and ball bearing construction for long service life. SKU/NBK Part: 20576.
The Fasco A330 (NBK 20576) is a purpose-built replacement for draft inducer assemblies found in select Fasco and Lennox residential furnaces. The draft inducer motor draws combustion gases through the heat exchanger and out the flue before and during burner operation -- a critical function for safe, efficient furnace performance. When this motor weakens or fails, the furnace control board will typically lock out ignition as a safety measure.
This motor matches the original electrical specifications (208-230V, 50/60 Hz, PSC configuration) and physical profile (3.3in diameter frame) of the OEM units it replaces, making it a straightforward swap without rewiring or bracket fabrication in most applications. Leads are pre-cut and terminated for direct connection to factory harnesses.
PSC design provides smooth, efficient single-phase AC operation and is the correct configuration for OEM inducer replacement in these Fasco and Lennox units.
Ball bearings handle the continuous-duty cycle of furnace operation better than sleeve bearings, offering longer service intervals and quieter running at speed.
Built-in thermal overload protection shuts the motor down if it overheats, protecting the motor and the furnace control board from secondary damage.
Listed to UL and CSA standards, meeting the safety requirements of residential furnace applications and most local codes.
This motor is a verified replacement for the following OEM and cross-reference part numbers. Confirm your existing motor's part number before ordering -- the label is typically on the motor housing or the inducer assembly cover plate.
Correct lead length and terminal type are essential for a clean, code-compliant installation. This motor ships with two harness configurations pre-installed:
These terminations are designed to mate directly with the factory connectors on the listed Fasco and Lennox inducer assemblies. No splicing or aftermarket terminals should be required for a direct replacement on the compatible models listed above.
Draft inducer replacement is a moderate-difficulty HVAC task. The motor mounts to the inducer housing using the existing bracket and hardware in most cases. Verify rotation direction before final assembly -- incorrect rotation will not move combustion air effectively and may trigger pressure switch faults. Most Lennox and Fasco inducer assemblies using this motor rotate counterclockwise when viewed from the shaft end.