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The Goodman B4022700 In-Shot Burner is a genuine OEM 3 in. single burner engineered for the WFM18070S4BXCC gas furnace. In-shot burners fire directly into the heat-exchanger tubes, mixing gas and primary air for a clean, stable blue flame. Furnaces use one burner per heat-exchanger cell, so the full set should be inspected together. Rusted, clogged, or corroded burners cause delayed ignition, roll-out, yellow flame, and sooting — replacing them restores efficient, safe combustion.
The genuine Goodman OEM burner is dimensioned to align exactly with the manifold and heat-exchanger inlet, ensuring the flame targets the tube correctly. Generic burners that sit even slightly off can cause flame impingement and premature heat-exchanger cracking, so OEM fit matters for both efficiency and safety.
Moderate. Requires removing the burner assembly/manifold, sliding the old burner off its locating tab, and seating the replacement so the orifice fires cleanly into the center of the tube. Verify flame quality after install. Gas work should be performed by a qualified technician; always shut off gas and power first.