Nordyne 661040R 0.040" LP Main Burner Orifice #40

The Nordyne 661040R 0.040" Main Burner LP Orifice #40 is a fine-tuning fuel-metering element used in the HVAC systems to control the flow of the LP gas to the main burner. Its essential role is to size and regulate the gas jet into the combustion chamber to maintain the right fuel-to-air ratio to allow steady ignition and burning. The installation is done by placing the orifice in the burner tube and screwing it during operation. In furnaces and boilers it assists to maintain the stable performance of flames and the proper heat production.