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The Goodman B4022700 3" In-Shot Burner is a genuine OEM gas burner designed for Goodman/Amana VMES800604BXAA 80% AFUE furnaces. Each in-shot burner directs a precise fuel-air mixture into its heat-exchanger tube for clean, efficient combustion. Corroded, rusted, or misaligned burners cause delayed ignition, roll-out, sooting, and uneven heating. Replacing worn burners as a set restores smooth light-off and even flame across all tubes.
Genuine OEM B4022700 burners are dimensioned to Goodman's manifold spacing and venturi geometry, ensuring the correct flame pattern and safe ignition. Generic burners can alter the air-fuel mix and flame carryover between tubes, risking delayed ignition and CO production. Because this part is directly tied to combustion safety, OEM is the recommended choice.
Plan on 45–60 minutes. You'll shut off gas and power, remove the burner assembly/manifold, swap the burner(s), and verify orifice alignment and cross-lighting. Gas and combustion work carries real safety risk — shut off the gas valve and electrical power, and have a licensed HVAC technician verify flame, roll-out, and CO after installation.