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The Goodman B4022700 In-Shot Burner is a genuine OEM 3 inch single-port gas burner engineered for WFD18070S3AXCC furnaces. In-shot burners fire directly into each heat-exchanger tube; the burner venturi mixes gas and primary air for a clean, stable blue flame. Rust, scale, or a distorted burner port causes rough ignition, delayed light-off, sooting, or roll-out — replacing worn burners restores safe, efficient combustion.
The genuine OEM burner has the correct venturi throat, port angle, and length so the flame lands properly in the heat-exchanger tube. Generic burners can mis-aim the flame, causing hot spots or incomplete combustion. Because this part directly affects combustion safety, OEM is strongly recommended. Replace all burners as a matched set for even firing.
Easy to Moderate — burners slide out of the manifold rack after removing the gas manifold. Plan 20–40 minutes for a full set. Shut off gas and power first, and verify flame quality after install. Gas work should be done by a qualified technician.