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The Goodman B4022700 In-Shot Burner is a genuine OEM 3-inch gas burner for your Goodman DMS80905CNA 80% single-stage furnace. In-shot burners deliver the gas/air mixture into each heat-exchanger tube, and one burner is used per exchanger cell. Rust, scale, misalignment, or a clogged crossover port causes delayed ignition, roll-out, yellow flames, or uneven heating — signs it's time to replace the burner(s).
Genuine Goodman in-shot burners are manufactured to the exact throat diameter, crossover-port geometry, and length that match the DMS80905CNA manifold and heat exchanger. This ensures proper flame carryover between cells and clean, quiet ignition. Generic burners can alter the air-fuel mixture, risking sooting, roll-out, or a failed flame-sensor read. For a combustion component, OEM is the safe choice — and burners should be replaced as a matched set.
Difficulty: Moderate (3/5). Involves shutting off gas and power, removing the burner assembly/manifold, and reseating burners on the correct orifices with proper alignment. Recommended for HVAC technicians. Always verify flame carryover and test for gas leaks after installation.