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The Goodman B4022700 3-inch In-Shot Burner is the genuine OEM gas burner for the GDH80403AXBB furnace. Each in-shot burner meters and directs the air/gas mixture into the heat exchanger for smooth, quiet ignition and an even flame. Replacing a rusted, clogged, or misfiring burner restores reliable lighting, correct flame carryover between burners, and efficient heat transfer.
OEM vs. Generic: The OEM B4022700 is manufactured to Goodman's exact orifice alignment and port pattern, ensuring proper flame characteristics and safe combustion. Generic burners can alter the flame profile and carryover timing, so the OEM burner is strongly recommended for combustion-critical service.
Install difficulty: Moderate (3/5). Requires removing the burner assembly and aligning the burner to its gas orifice. Recommended for experienced DIYers or a licensed HVAC technician. Always shut off gas and power before servicing and verify compatibility before ordering.