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This genuine OEM Goodman/Amana 3-inch in-shot burner (part B4022700) is a direct-fit replacement for the AMH80803BNAA 80% AFUE gas furnace. In-shot burners meter and shape the gas/air mixture as it fires into each heat-exchanger tube. A rusted, cracked, or clogged burner causes uneven flames, delayed ignition, roll-out, or noisy combustion — replacing worn burners restores clean, quiet, even ignition across the burner rack.
Burner length, port orifice, and slot geometry determine the flame shape and how it aligns with the heat-exchanger inlet. The OEM B4022700 is built to the exact 3-inch AMH80803BNAA specification for correct flame carryover and combustion. Generic burners may misalign or produce improper flames, so the OEM part is recommended. Replace all burners in a set together for uniform performance.
Moderate (2/5) — Shut off gas and power, remove the burner-retention bracket, slide out the old burner, and seat the replacement so it aligns with the heat-exchanger inlet and igniter/sensor. Verify flame carryover on start-up. Time: 20–40 minutes; a qualified technician is recommended when working on gas components.