Nordyne 661029R 0.029" Natural Main Burner Orifice #29

The Nordyne 661029R Natural Main Burner Orifice #29 is a gas-flow component that meters natural gas into the main burner at the specified rate for compatible HVAC systems. Its calibrated 0.029-inch opening regulates the volume of fuel entering the burner, supporting the intended gas-to-air mixture for combustion. It is placed into the burner assembly at the specified gas inlet position and should match the furnace model, fuel type, and burner specifications. It provides a significant metering point between the gas supply and combustion chamber, contributing to consistent flame features and appropriate burner output when correctly matched to the unit.