Nordyne Intertherm 661021 Burner Orifice Natural Gas Replacement Fits M1GH077

Product Description

The Nordyne Intertherm 661021 is a natural gas burner orifice designed as a direct replacement part for Intertherm furnace models, including the M1GH077. The burner orifice is a small but critical component in any gas-fired heating system. It controls the flow of natural gas into the burner assembly, metering the precise amount of fuel needed for safe and efficient combustion. Without a properly sized and functioning orifice, a furnace can run too rich or too lean, leading to incomplete combustion, sooting, carbon buildup, or unsafe operating conditions. HVAC technicians and service professionals rely on OEM-spec replacement orifices like the 661021 to restore correct burner performance and maintain system safety standards. The Nordyne Intertherm 661021 is matched specifically to the gas pressure and BTU output requirements of the furnace models it serves, ensuring the correct fuel-to-air ratio at the burner. Natural gas orifices are drilled to a specific diameter to deliver the right flow rate at standard supply pressure, typically measured in inches of water column. Using the wrong orifice size, even one that appears similar, can result in poor heat output, flame rollout, or a failed inspection. This part is intended for natural gas applications only and should not be used with propane or LP gas systems, which require a different orifice size. HVAC service technicians replacing a cracked, clogged, corroded, or damaged orifice on an Intertherm M1GH077 or compatible Nordyne-platform furnace will find the 661021 to be a reliable, specification-correct replacement. Proper installation requires shutting off the gas supply and following all applicable local codes and manufacturer service procedures. This part supports ongoing furnace maintenance, burner tune-ups, and heating system repairs.

• Direct replacement burner orifice for Intertherm and Nordyne gas furnaces including the M1GH077
• Calibrated for natural gas fuel supply at standard operating pressure
• Critical combustion component that meters gas flow for safe and efficient burner operation

Product Highlights

The Nordyne Intertherm 661021 is an OEM-spec natural gas burner orifice built for precise fuel metering in compatible Nordyne and Intertherm furnace models. It is a dependable replacement part for HVAC technicians performing burner service and heating system repairs.

Product Information

Standard Information

• Brand: NORDYNE INTERTHERM
• Manufacturer Part Number: 661021

Technical Specifications

• Fuel Type: Natural Gas
• Compatible Model: Intertherm M1GH077
• Part Type: Burner Orifice
• Application: Gas Furnace Burner Assembly