Sterling HVAC 11J36R04694-028 Standard Orifice Natural Gas #42

The Sterling HVAC 11J36R04694-028 Standard Orifice Natural Gas meters fuel flow to the burner through its calibrated #42 opening. The specified orifice size establishes the available gas passage and controls the amount of fuel entering the burner manifold. Threaded into the manifold, it provides the restricted passage through which natural gas reaches the firing section. The calibrated opening establishes the gas flow required for the connected combustion assembly in HVAC systems. This metering action maintains consistent fuel delivery and supports the specified air-to-fuel mixture during burner operation.