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The Goodman B4022700 3-Inch In-Shot Burner is the genuine OEM combustion burner used in the ACEC801005CXAA gas furnace. The in-shot design mixes gas and primary air into a stable, directed flame that ignites cleanly and carries into the heat-exchanger tube. Replacing warped, rusted, or clogged burners restores proper flame shape, eliminates rollout and delayed-ignition rumble, and improves combustion efficiency.
OEM B4022700 burners are stamped to the correct venturi geometry so the flame seats exactly where the manufacturer intended. Generic burners can shift the flame, causing soot, hot spots, and premature heat-exchanger failure. Replace all burners as a set for an even, balanced flame across the manifold.
Moderate (2/5). Shut off gas and power, remove the burner assembly bracket, slide the old burner off the manifold orifice, and seat the new one. Verify flame appearance after restart. Recommended for experienced DIYers or a licensed technician.