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The Goodman/Amana B4022700 is a factory-original 3-inch in-shot (single) gas burner for the AMS80604BXAD 80% AFUE furnace. Each in-shot burner delivers a metered gas/air mixture to one heat-exchanger tube for consistent ignition and a clean, stable blue flame. Rust, scale, or a warped burner causes delayed ignition, flame roll-out, sooting, or noisy startups — replacing the affected burner(s) restores smooth, safe firing. Sold individually; order the quantity your furnace requires.
Aftermarket burners can vary in venturi geometry and port drilling, which shifts the air/fuel mixture and can cause lifting flames or incomplete combustion. The genuine Goodman B4022700 matches the factory orifice alignment and flame characteristics exactly, so ignition timing and CO levels stay within spec.
Moderate — 30–60 minutes for a full set. Requires shutting off gas and power, removing the burner assembly, swapping burners, and confirming proper flame and orifice alignment on restart. Recommended for experienced DIYers or a licensed technician; verify combustion after install.