What are the specs for this Heat Exchanger?

The correct replacement for Goodman model OEM Goodman 24-1/2" 6-Cell Heat Exchanger GMNT120-5D — 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 OEM Goodman 24-1/2" 6-Cell Heat Exchanger GMNT120-5D — 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" 6-Cell Heat Exchanger GMNT120-5D — 4821404S

Name: OEM Goodman 24-1/2" 6-Cell Heat Exchanger GMNT120-5D — 4821404S
Brand: Goodman
SKU: GOODMAN-11771
Price: 433.95 USD
Availability: InStock

SKU: GOODMAN-11771 Brand: Goodman

$433.95 $559.95

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The Goodman 4821404S Heat Exchanger is a genuine OEM 24-1/2 inch, 6-cell heat exchanger assembly built for the GMNT120-5D 120,000 BTU gas furnace. The heat exchanger is the heart of the furnace — combustion gases pass through its cells while blower air passes over them, transferring heat to your home without mixing the airstreams. A cracked or rusted heat exchanger is a serious carbon-monoxide safety hazard and the most common reason for a full-assembly replacement.

Specifications

OEM Part Number: 4821404S
Brand: Goodman
Size: 24-1/2 inch
Configuration: 6-cell / 6-tube clamshell
Equipment Type: Gas Furnace
Compatible Model: GMNT120-5D
Material: Aluminized steel

OEM vs. Generic

This factory Goodman assembly matches the exact cell count, tube geometry, and mounting flanges of the GMNT120-5D. Generic heat exchangers are effectively unavailable for this application, and any substitution would compromise combustion efficiency and safety certification. OEM is the only recommended option.

Installation Difficulty

Expert — Professional required. This is a major furnace repair requiring complete teardown of the burner assembly, gas manifold, and blower section, followed by combustion analysis and CO testing. Must be performed by a licensed HVAC technician; many jurisdictions require permitting.

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" 6-Cell Heat ...

$433.95

Frequently Asked Questions

Does this Heat Exchanger fit my Goodman OEM Goodman 24-1/2" 6-Cell Heat Exchanger GMNT120-5D — 4821404S?

Yes. This is the factory-specified OEM heat exchanger for the Goodman OEM Goodman 24-1/2" 6-Cell Heat Exchanger GMNT120-5D — 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 OEM Goodman 24-1/2" 6-Cell Heat Exchanger GMNT120-5D — 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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