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The Goodman B4022700 3-Inch In-Shot Burner is the genuine OEM gas burner used in the manifold assembly of your Goodman GMV81155CXBA 80% AFUE two-stage furnace (115,000 BTU input). In-shot burners direct the gas/air mixture into the heat-exchanger cells for clean, even combustion. Rust, scale, or a distorted burner face causes rough ignition, delayed light-off, flame rollout, or uneven heating — all corrected by replacing the affected burner(s).
This is the factory OEM burner, matched to the furnace's orifice sizing and heat-exchanger geometry for correct flame characteristics. Off-brand burners can shift flame position, cause improper combustion, or trip flame-sensing and rollout switches. Because burners affect combustion safety, we recommend the exact OEM part and replacing all burners as a set when several show wear.
Moderate (3 of 5). Requires shutting off gas and power, removing the burner-box cover and manifold, swapping the burner(s), and verifying flame quality on restart. Best performed by a qualified HVAC technician. Always test for gas leaks after service.
Compatibility note: verify your model, serial, and gas type before ordering. Contact info@nationalhvacparts.com with questions.