What are the specs for this Heat Exchanger?

The correct replacement for Goodman model GMNT120-5 — 2921306S is this exact part. It is the factory-specified replacement with exact OEM specifications. Using a part with different specifications can cause equipment damage or void your warranty. You can verify this by checking the data plate on your Goodman equipment which lists the model number GMNT120-5 — 2921306S.

What symptoms indicate I need a new heat exchanger?

Common symptoms that indicate you need a new heat exchanger include unusual noises, intermittent operation, complete failure to operate, or visible damage. For specific diagnostic guidance, visit nationalhvacparts.com/pages/hvac-diagnostic.

Is this heat exchanger compatible with Bryant or Payne systems too?

Many Goodman parts are cross-compatible with Bryant and Payne systems since all three brands are manufactured by Carrier Global Corporation. The same physical part is often used across multiple brand labels with different model numbers. To verify cross-compatibility, check your Bryant or Payne equipment service manual for cross-compatible part numbers, or contact info@nationalhvacparts.com with your model number for confirmation.

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Goodman

OEM Goodman Heat Exchanger for GMNT120-5 — 2921306S

Name: OEM Goodman Heat Exchanger for GMNT120-5 — 2921306S
Brand: Goodman
SKU: GOODMAN-11742
Price: 574.95 USD
Availability: InStock

SKU: GOODMAN-11742 Brand: Goodman

$574.95 $749.95

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The Goodman 2921306S is a genuine OEM clamshell heat exchanger for the GMNT120-5 gas furnace. The heat exchanger transfers combustion heat to the supply air while keeping flue gases separated from the home's airstream. A cracked, rusted, or perforated exchanger is a serious safety issue that can leak carbon monoxide — this factory replacement restores safe, efficient operation.

Type: Aluminized-steel clamshell heat exchanger assembly
Application: 115,000–120,000 BTU furnace section
Material: Aluminized steel for corrosion and thermal-fatigue resistance
Includes: Exchanger cells as originally supplied
Fits: Goodman GMNT120-5 and compatible GMNT series

OEM vs. Generic: The heat exchanger is the single most safety-critical component in a furnace. Only a genuine Goodman OEM exchanger guarantees the exact cell geometry, weld integrity, and clearances the furnace was certified with. Aftermarket exchangers are strongly discouraged for this component.

Install difficulty: Professional / Hard (5 of 5). Replacement requires near-complete furnace disassembly — removing the burners, gas valve, blower, and inducer — plus post-install combustion and CO testing. This job should be performed by a licensed HVAC technician. Always confirm the exchanger is not still under Goodman's limited warranty before purchasing.

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

OEM Goodman Heat Exchanger for G...

$574.95

Frequently Asked Questions

Does this Heat Exchanger fit my Goodman GMNT120-5 — 2921306S?

Yes. This is the factory-specified OEM heat exchanger for the Goodman GMNT120-5 — 2921306S. It is a direct drop-in replacement that fits without modification. Always verify the model number on your equipment nameplate before ordering.

How do I replace the heat exchanger on my Goodman GMNT120-5 — 2921306S?

Refer to your equipment service manual for model-specific steps. General approach: turn off power, photograph connections, remove old part, install new part, restore power and test. For gas components, hire a licensed technician. Email info@nationalhvacparts.com for guidance.

What symptoms mean I need a new heat exchanger?

Common symptoms: unusual noises, intermittent operation, complete failure, or visible damage. Visit our diagnostic hub for symptom-based troubleshooting.

Is this heat exchanger compatible with Bryant or Payne too?

Many Goodman parts are cross-compatible with Bryant and Payne since all three brands are manufactured by Carrier Global Corporation. The same physical part is often used across brand labels with different model numbers. To verify: check your Bryant or Payne equipment service manual for cross-compatible part numbers, or email info@nationalhvacparts.com with your model number.

Should I use OEM or aftermarket for my Goodman heat exchanger?

OEM recommended for reliability and warranty compatibility. OEM parts match exact factory specifications for proper fit, performance, and safety. While aftermarket alternatives cost less upfront, the risk of improper fit and reduced lifespan usually makes OEM the better value long-term.

How fast does National HVAC Parts ship?

Orders placed before 3:00 PM CST ship the same business day. Standard delivery is 2–5 business days anywhere in the continental United States. Express shipping available at checkout. We ship from Houston, TX to all 50 states. 30-day return policy on all parts.

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OEM Goodman Heat Exchanger for GMNT120-5 — 2921306S

Shipping Information

Return Policy

Frequently Asked Questions