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This is a standard #45 drill size orifice calibrated for natural gas applications in specific furnace models
this furnace gas orifice resists thermal expansion and corrosion
the Johnson Controls DMPR-RS311 is a critical fire safety component engineered specifically for FD-1300 Series dynamic multi-blade fire dampers
ensuring the seal does not flatten or fail under pressure
Nordyne 661057R Orifice This is a standard #45The Nordyne 661057R is a critical OEM replacement part designed for precision fuel metering in high efficiency heating systems. Featuring a . 057 orifice diameter, this LP burner orifice is engineered to maintain the correct gas to air ratio for Liquid Propane applications. It serves as the direct replacement for Nordyne 661057, ensuring seamless integration into N Series burner manifolds commonly found in Intertherm burner systems, Miller furnaces,
