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The Goodman B4022700 3-inch In-Shot Burner is a genuine OEM replacement for the AMES800403AXAA 80% AFUE gas furnace. Each in-shot burner directs a metered jet of gas and primary air into a heat-exchanger tube, where it ignites for clean, efficient combustion. Rust, scale, or a distorted burner slot causes rough ignition, flame roll-out, sooting, and uneven heating — all reasons to replace with genuine OEM.
The genuine OEM burner is stamped to the precise venturi geometry and port pattern the furnace was certified with, preserving the factory flame profile. Generic burners can differ in air-shutter dimensions, altering the flame and combustion quality. Match burners across the manifold for balanced firing — replace as a set when possible.
Moderate — remove the burner assembly, slide the burner off the manifold orifice, and align the new unit to the heat-exchanger inlet. 30–45 minutes. Shut off gas and power first; verify flame and check for leaks after service.