York S1-9951-0861 LP Gas Orifice #44

The York S1-9951-0861 LP Gas Orifice is a burner metering component used to regulate the amount of propane entering the combustion assembly. It is sized as a #44 opening, allowing controlled fuel flow through a calibrated aperture to maintain proper flame features. In HVAC systems, it is commonly used in York gas-fired furnaces and unit heaters where it is fitted into the burner manifold to deliver consistent gas distribution across ignition cycles. This is positioned at the burner inlet section of the gas train, supporting stable combustion behavior during heating operation in residential and light commercial equipment setups.