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The Goodman B4022700 3-Inch In-Shot Burner is a genuine OEM single burner tube for the AMS81155CNA gas furnace. In-shot burners deliver a precise, high-velocity fuel/air stream into each heat-exchanger tube for clean, efficient combustion. Over years of cycling, burners collect rust flakes and scale that distort the flame and cause delayed ignition, roll-out, or a lazy yellow burn — replacing worn burners restores a crisp blue flame and reliable light-off.
Flame characteristics depend on exact orifice alignment and burner-throat geometry. The genuine Goodman B4022700 guarantees the correct venturi shape and spacing for a stable flame carry-over across the burner assembly. Generic burners can misalign with the orifice, causing rough ignition and elevated CO. For combustion components, OEM is strongly recommended. Replace all burners as a set for even flame distribution.
Moderate (3/5). Requires removing the burner assembly and, ideally, verifying flame and combustion afterward. Shut off gas and power. Best performed by a licensed HVAC technician with a combustion analyzer.
Note: This is a genuine OEM Goodman replacement part. National HVAC Parts is not affiliated with or endorsed by Goodman Manufacturing.