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The Goodman B4022700 3-Inch In-Shot Burner is a genuine OEM replacement burner for the VMS80403ANAA gas furnace and other Goodman/Amana 80% AFUE furnaces that use the in-shot burner design. Each in-shot burner directs a precise fuel/air mixture into its heat-exchanger tube; a rusted, clogged, or cracked burner causes uneven flames, delayed ignition, sooting, and rumble on start-up. Replacing a failed burner restores clean, quiet, efficient combustion.
OEM Goodman burners are stamped to the exact port geometry and flame-carryover spacing of your furnace, ensuring proper ignition timing and CO-safe combustion. Generic burners may fit dimensionally but alter the flame pattern, risking cross-lighting failures and hot spots on the heat exchanger. Always replace burners as a matched set for even firing.
Moderate (3/5). Requires removing the burner-box cover, gas manifold, and igniter to slide burners off their locating slots. Best performed by an HVAC technician who can verify manifold pressure and inspect the flame pattern afterward. Shut off gas and power before servicing.