What are the specs for this Heat Exchanger?

The correct replacement for Goodman model GMNT120-5 — 4821404S 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 — 4821404S.

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 24-1/2 in 6-Cell Heat Exchanger for GMNT120-5 — 4821404S

Name: OEM Goodman 24-1/2 in 6-Cell Heat Exchanger for GMNT120-5 — 4821404S
Brand: Goodman
SKU: GOODMAN-11748
Price: 433.95 USD
Availability: InStock

SKU: GOODMAN-11748 Brand: Goodman

$433.95 $564.15

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The Goodman 4821404S Heat Exchanger is a genuine OEM 24-1/2 inch, 6-cell (clamshell) assembly for the GMNT120-5 120,000 BTU gas furnace. The heat exchanger is the heart of the furnace — combustion gases pass through its cells while blower air flows across the exterior, transferring heat to your home while keeping toxic flue gases fully separated from breathable air. A cracked or corroded exchanger is a carbon monoxide hazard and must be replaced.

Specifications

Configuration: 6-cell clamshell heat exchanger
Dimension: 24-1/2 in
Furnace capacity: 120,000 BTU class (GMNT120-5)
Material: Aluminized steel
Fit: Goodman/Amana GMNT120-5

OEM vs. Generic

The genuine OEM 4821404S is dimensionally matched to the GMNT120-5 cabinet, burner rack, and inducer drafting. Because heat exchangers are a combustion-safety component, using the exact OEM part is essential — an ill-fitting generic can misalign burners, disturb draft, and create CO risk. Many Goodman furnaces also carry a limited lifetime heat-exchanger warranty; OEM parts preserve eligibility.

Installation Difficulty

Professional installation required (advanced). This job involves gas disconnection, teardown of the burner assembly and blower deck, and post-install combustion testing. It should be performed by a licensed HVAC technician with proper CO testing equipment.

Compatible with GMNT120-5. Confirm cabinet width and cell count before ordering.

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 24-1/2 in 6-Cell Hea...

$433.95

Frequently Asked Questions

Does this Heat Exchanger fit my Goodman GMNT120-5 — 4821404S?

Yes. This is the factory-specified OEM heat exchanger for the Goodman GMNT120-5 — 4821404S. 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 — 4821404S?

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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