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The Goodman B4022700 3-inch In-Shot Burner is a genuine OEM combustion burner for the Amana/Goodman AMH81005CNAA gas furnace. In-shot burners deliver a precisely shaped gas-air mixture into the heat exchanger tubes for clean, efficient, and quiet ignition. Furnaces of this class use multiple burners, so order the quantity that matches your unit.
Burner geometry and port sizing directly affect flame quality, ignition reliability, and combustion efficiency. The OEM B4022700 matches the factory orifice and heat-exchanger spacing exactly. Generic burners can cause delayed ignition, sooting, or uneven heating, so we recommend the genuine part for consistent performance.
Moderate (3/5). Replacing burners requires removing the burner assembly, disturbing the manifold and orifices, and correct realignment with the heat-exchanger inlets. Recommended for experienced DIYers or a qualified technician. Shut off gas and power, and verify clean ignition and proper flame appearance after reassembly.