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The Goodman B4022700 3 inch In-Shot Burner is the OEM burner used in the ACES800403ANAA furnace and matching Goodman and Amana gas furnace manifolds. In-shot burners direct the gas/air mixture into the heat exchanger tubes for ignition; when one corrodes, rusts, or clogs you get delayed ignition, rollout, uneven heating, or noisy lightoff. Replacing the full burner set with genuine units restores a crisp, even blue flame.
The factory B4022700 is built to the exact orifice alignment, venturi length, and port pattern the furnace was certified with, so the flame and firing rate stay within spec. Generic burners can misalign with the manifold orifices and cause poor combustion. For a combustion component, OEM is strongly recommended and keeps the appliance listing valid.
Moderate — roughly 30–45 minutes for a full set. Shut off gas and power, remove the manifold/burner assembly, slide each burner off its orifice, install the new B4022700 units, and verify alignment before relighting. Combustion work should be performed by, or verified by, a licensed HVAC technician.