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Fasco A157 / 7021-9450 & 7021-10702 Furnace Draft Inducer Venter Blower Motor Assembly (Carrier / Bryant 320725-756) Engineering Diagram
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SPECFOUNDRY SKU: SF-HVC-103 · BRAND REF: Fasco / A.O. Smith

Fasco A157 / 7021-9450 & 7021-10702 Furnace Draft Inducer Venter Blower Motor Assembly (Carrier / Bryant 320725-756)

Stamped Casting / OEM Numbers: 7021-9450 7021-10702 320725-756 HC21ZE117 A157 J238-150-1571

Compatible Units: Carrier, Bryant, Payne & Day & Night 58PAV, 58RAV, 58SSC, 58SXC, 373LAV, 383KAV, 398AAW 80% Gas Furnaces

Critical Dimensions & Spec: 115V AC, 60Hz, 1.8 Amp, 3000 RPM shaded-pole ball-bearing motor; 1/30 HP; CCW rotation; includes blower wheel & cooling fan

$124.99
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Pre-Order Dimensional Verification Checklist

OEM Cross-Reference & Stamped Casting Number Table

Use this cross-reference table to confirm that the number stamped or printed on your original hardware or circuit board corresponds to SpecFoundry SKU SF-HVC-103:

Stamped / OEM Part Number Manufacturer / System Brand Compatible Models & Years SpecFoundry Replacement SKU
7021-9450Fasco / A.O. SmithCarrier, Bryant, Payne & Day & Night 58PAV, 58RAV, 58SSC, 58SXC, 373LAV, 383KAV, 398AAW 80% Gas FurnacesDirect Match (SF-HVC-103)
7021-10702Fasco / A.O. SmithCarrier, Bryant, Payne & Day & Night 58PAV, 58RAV, 58SSC, 58SXC, 373LAV, 383KAV, 398AAW 80% Gas FurnacesDirect Match (SF-HVC-103)
320725-756Fasco / A.O. SmithCarrier, Bryant, Payne & Day & Night 58PAV, 58RAV, 58SSC, 58SXC, 373LAV, 383KAV, 398AAW 80% Gas FurnacesDirect Match (SF-HVC-103)
HC21ZE117Fasco / A.O. SmithCarrier, Bryant, Payne & Day & Night 58PAV, 58RAV, 58SSC, 58SXC, 373LAV, 383KAV, 398AAW 80% Gas FurnacesDirect Match (SF-HVC-103)
A157Fasco / A.O. SmithCarrier, Bryant, Payne & Day & Night 58PAV, 58RAV, 58SSC, 58SXC, 373LAV, 383KAV, 398AAW 80% Gas FurnacesDirect Match (SF-HVC-103)
J238-150-1571Fasco / A.O. SmithCarrier, Bryant, Payne & Day & Night 58PAV, 58RAV, 58SSC, 58SXC, 373LAV, 383KAV, 398AAW 80% Gas FurnacesDirect Match (SF-HVC-103)

Common Failure Symptoms Solved by SF-HVC-103

Technicians and property owners typically replace 7021-9450 when experiencing one or more of the following failure modes:

  • Furnace draft inducer squeals or screeches loudly at startup
  • Pressure switch error code flashing because corroded blower wheel lost static vacuum
  • Seized inducer motor humming and tripping thermal overload

Step-by-Step Dimensional Verification & Installation Notes

Shut off 120V furnace service switch. Disconnect 2-wire Molex plug and ground screw, unbolt 4 collector box mounting screws, transfer or install new fiberglass collector gasket, and mount assembly.

Related Technical Guide: Taco 571-2 vs. Honeywell V8043E Zone Valve Powerheads, B&G Couplers & Boiler Cross-Reference →

Frequently Asked Technical Questions (7021-9450)

Where is the casting or OEM part number (7021-9450 / 7021-10702 / 320725-756) stamped on this part?

On Fasco / A.O. Smith assemblies, look for the stamped or die-cast numbers (7021-9450, 7021-10702, 320725-756, HC21ZE117, A157, J238-150-1571) on the underside of the metal housing, along the link arm, on the stainless hinge track, or printed on the circuit board/valve label. Note that casting numbers identify the housing casting, so always confirm critical dimensions (115V AC, 60Hz, 1.8 Amp, 3000 RPM shaded-pole ball-bearing motor; 1/30 HP; CCW rotation; includes blower wheel & cooling fan) as well.

Does SpecFoundry SKU SF-HVC-103 directly replace OEM part 7021-9450 (7021-9450, 7021-10702, 320725-756, HC21ZE117, A157, J238-150-1571)?

Yes. SF-HVC-103 is verified to match the mounting footprint, electrical/mechanical ratings, and dimensional envelope of Fasco / A.O. Smith 7021-9450, 7021-10702, 320725-756, HC21ZE117, A157, J238-150-1571 used on Carrier, Bryant, Payne & Day & Night 58PAV, 58RAV, 58SSC, 58SXC, 373LAV, 383KAV, 398AAW 80% Gas Furnaces.

What measurements should I verify before ordering SF-HVC-103?

Before ordering, verify: (1) Stamped or OEM code matches one of 7021-9450, 7021-10702, 320725-756, HC21ZE117, A157, J238-150-1571; (2) Dimensional spec matches: 115V AC, 60Hz, 1.8 Amp, 3000 RPM shaded-pole ball-bearing motor; 1/30 HP; CCW rotation; includes blower wheel & cooling fan; and (3) Application matches: Carrier, Bryant, Payne & Day & Night 58PAV, 58RAV, 58SSC, 58SXC, 373LAV, 383KAV, 398AAW 80% Gas Furnaces.

How fast does SF-HVC-103 ship and what payment methods are accepted?

SF-HVC-103 ships within 1–2 business days from our US warehouse network. Flat-rate US Ground shipping is $8.95, or FREE on orders of $150+. You can check out online immediately via PayPal, Venmo, Credit/Debit Card, or request an Instant Card Payment Link / Net-30 Commercial PO Invoice.

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