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The Goodman B4022700 In-Shot Burner is a genuine OEM 3-inch combustion burner engineered for the AMS80903BNAA gas furnace and compatible Goodman/Amana 80% AFUE models. Each in-shot burner directs the gas/air mixture into a single heat-exchanger tube for clean, efficient combustion. Replacing worn, rusted, or clogged burners restores a stable blue flame and prevents delayed ignition, sooting, and uneven heating.
The OEM version is a genuine Goodman burner with the exact venturi geometry and port sizing for correct flame characteristics and rack alignment. The Generic version is a quality-matched 3" in-shot burner that meets the same combustion spec at a lower price — a solid choice for full burner-rack refreshes.
Moderate (2 of 5). Shut off power and gas, remove the burner-box cover and manifold/orifice bar, slide out the old burners, and seat the replacements onto the rack. Verify flame color and check for gas leaks after reassembly. Budget 30–45 minutes.