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The Goodman B4022700 is a genuine OEM 3-inch in-shot burner for the AMEC800403ANAA gas furnace and compatible Goodman/Amana models. In-shot burners fire a precise gas/air mixture into each heat-exchanger tube; a corroded, clogged, or misaligned burner causes rough ignition, delayed light-off, flame rollout, or uneven heat. Replacing worn burners restores clean, quiet, on-demand ignition and proper flame geometry.
OEM vs. Generic: The OEM B4022700 is built to the exact venturi diameter and port pattern the furnace was engineered around, so flame carry-over and burner-to-orifice alignment stay correct. Generic burners can shift the flame profile and trigger flame-sensor or rollout faults. For safe, spec-correct combustion, use the OEM burner.
Install difficulty: Moderate (3/5). Shut off gas and power, remove the burner assembly bracket, slide out the old burner, seat the new burner over the orifice with correct alignment, and reassemble. Inspect flame sensor and igniter while apart. Plan on 30–60 minutes; verify a crisp blue flame and no rollout after restart.