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The Goodman B4089343 #43 Burner Orifice is a genuine OEM gas spud precision-drilled to a #43 bore for the Goodman GMP150-5 gas furnace. The orifice meters the exact volume of gas delivered to each burner, producing a clean, correctly shaped flame. A clogged, corroded, or wrong-size orifice causes lifting flames, sooting, poor ignition, and reduced heat output — replacing it restores safe, efficient combustion.
Orifice sizing is critical to safe gas metering. The OEM Goodman #43 orifice is drilled and gauged to factory tolerance for the correct BTU input. Off-brand orifices can vary in bore diameter and thread pitch, risking over- or under-firing. For a combustion component, always match the exact OEM size.
Involves the gas train — shut off the gas supply and power before servicing. Remove the burner, thread in the correct orifice, reinstall, and leak-check every joint before relighting. Because this affects gas combustion, we recommend a licensed HVAC technician perform this replacement.