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The Goodman B4022700 3-inch In-Shot Burner is a genuine OEM gas burner engineered for the AMVC80905CXAA two-stage variable-speed furnace. Each in-shot burner directs a precisely metered air/gas mixture into its heat-exchanger tube, producing a stable, efficient flame for clean, complete combustion. Furnaces use one burner per exchanger cell, so replacing a corroded or misfiring unit restores even heating across the assembly.
Burner venturi diameter and port geometry are tuned to the furnace's gas orifice and manifold pressure. A generic burner that mixes air and gas differently can cause flame lift, roll-out, sooting, or delayed ignition. This OEM burner matches the factory combustion spec, so the flame profile stays correct and the flame sensor reads reliably.
Moderate (3/5). Burners are typically replaced as a matched set for even performance. Requires removing the burner assembly, aligning each burner to its orifice, and verifying flame quality and flame-sense current after reassembly. Shut off gas and power first — if you are not comfortable working around the gas manifold, use a licensed technician.