OEM Goodman 3-inch In-Shot Burner for GMNT120-5D — B4022700

Goodman B4022700 3-Inch In-Shot Burner

The Goodman B4022700 is a genuine OEM 3-inch in-shot burner engineered as a direct-fit replacement for the GMNT120-5D gas furnace and many compatible Goodman/Amana models. In-shot burners deliver the gas/air mixture into the heat-exchanger tubes; each burner in the manifold assembly must be clean and correctly aligned for quiet, complete, and efficient combustion.

Over time, burners collect rust flakes, spider webs, and scale that distort the flame, cause delayed ignition “whoomph” sounds, roll-out trips, or a lazy yellow flame. Replacing worn or corroded burners restores a crisp blue flame and helps prevent nuisance safety lockouts.

Specifications

• Style: 3-inch in-shot / mono-port burner
• Steel construction with factory orifice alignment
• Sold individually — order one per heat-exchanger tube
• Fits Goodman GMNT120-5D and compatible furnaces
• Genuine Goodman OEM part number B4022700

OEM vs. Generic

The OEM B4022700 matches the exact venturi length, port size, and mounting slot of your original burners, so flame geometry and clearances stay within spec. Generic burners may vary in length or port diameter, shifting flame position relative to the flame sensor and heat exchanger and risking incomplete combustion. For a combustion component, OEM fit matters — choose the genuine part.

Installation Difficulty

Easy–Moderate (2 of 5). Roughly 20–30 minutes to swap the burner set. Turn off gas and power, remove the burner box or bracket, slide out the old burners, and seat the replacements in the same orientation. Always verify flame appearance and check for gas leaks after service, or have a licensed HVAC technician perform the work.