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The Goodman B4022700 3-inch In-Shot Burner is the genuine OEM burner used in the manifold assembly of the ADSH800403AXAA gas furnace and compatible Goodman/Amana models. Each in-shot burner directs the gas/air mixture into one tube of the heat exchanger for clean, even combustion. Rust, scale, or a distorted burner port causes rough ignition, flame rollout, sooting, or delayed light-off — replacing the affected burner(s) restores a crisp, blue, properly seated flame.
This is a genuine OEM Goodman burner machined to the exact port size and venturi geometry the furnace was certified with. Because the burner directly controls the air/fuel mixture, a mismatched generic can change the flame characteristics — for a combustion component we strongly recommend OEM.
Moderate (3/5). Requires shutting off the gas, removing the burner box/manifold, swapping the burner(s), and reassembling. After install, verify burner alignment, ignition, and flame quality — this is a combustion repair best confirmed by a qualified HVAC technician.