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The genuine Goodman B4022700 3-inch In-Shot Burner is a direct-fit OEM replacement for the Goodman WGFM28090V5CXAA gas furnace. In-shot burners direct a precisely metered gas/air mixture straight into each heat-exchanger tube, producing the clean blue flame the furnace needs for efficient, complete combustion. Rust, scale, or a distorted burner slot causes yellow-tipped or lazy flames, delayed ignition, roll-out, and sooting — all signs a burner should be replaced.
Burner geometry — port size, venturi throat, and mounting slot — is engineered to match the WGFM28090V5CXAA's gas valve orifice and heat-exchanger spacing. The OEM B4022700 slides into the factory rack and lines up with the igniter, sensor, and crossover for a proper flame carry-over. Generic burners with slightly different throat dimensions can shift the air/fuel ratio and cause uneven ignition across tubes, so matching the exact OEM burner is strongly recommended. Replace as a full matched set for best results.
Plan 30–45 minutes. Shut off gas and power, remove the burner-box cover, note burner orientation and igniter/sensor position, slide out the old burner, and seat the replacement in the same slot. Verify a clean blue flame and proper carry-over on first fire; if unsure, have a licensed HVAC technician confirm combustion.