Nordyne 661043R Orifice

The Nordyne 661043R Orifice is a precision-machined #43 main burner orifice engineered for high-efficiency gas combustion in residential and mobile home heating systems. As a critical component in the gas burner assembly, this orifice is sized specifically to regulate natural gas flow rates into the primary burner tubes of Nordyne, Intertherm, and Miller furnaces, including MGH and M1 series equipment. Technical professionals recognize the .043 orifice size as a standard for maintaining correct manifold pressure and ensuring a clean, blue flame without excessive soot or carbon monoxide. Utilizing an OEM Nordyne part for furnace repair or LP-to-NG conversion ensures that the internal bore diameter remains consistent with factory fuel-to-air ratio specifications. This replacement main burner orifice is constructed from durable brass to withstand high temperatures and rapid thermal cycling, preventing the port erosion that often leads to inefficient furnace heating performance. Proper installation of the 661043R is vital for achieving the rated BTU output across Nordyne furnace models.

• Optimized Gas Flow: Precision-drilled #43 burner orifice ensures the exact BTU delivery required for efficient combustion and consistent heat output.
• OEM Compatibility: Specifically designed for Nordyne, Miller, and Intertherm furnaces, including high-volume M1 and MGH series gas units.
• Reliable Heat Transfer: High-grade brass construction resists clogging and thermal deformation, maintaining safe furnace operation over long-term use.
• Versatile Application: Ideal for replacing damaged orifices or completing gas furnace maintenance where port integrity has been compromised.

What furnace models is the Nordyne 661043R compatible with?
This #43 orifice is primarily used in Nordyne, Intertherm, and Miller gas furnaces, specifically within the M1 and MGH model series. It is frequently employed in natural gas applications or high-altitude LP kits depending on specific OEM manifold requirements.

How can I tell if my furnace orifice needs replacement?
Inspect for physical port erosion, cross-threading, or persistent soot build-up. If the burner orifice is restricted or resized through improper cleaning, it will cause improper air-fuel mixing, resulting in yellow tipping or delayed ignition.

Can this orifice be used for LP conversion?
While the 661043R is a #43 size, fuel conversion must be verified against the manufacturer’s conversion chart. Always cross-reference the required orifice size for your specific altitude and fuel type (Natural Gas vs. Propane) before installation.

Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.