Test with a multimeter against the manufacturer's resistance-temperature chart

as different BTU inputs may require specific gasket dimensions

ensuring zero-clearance issues during installation

Engineered for industrial-grade durability in high-cycle HVAC control systems

York S1-029-20423-042 Orifice Test with a multimeter againstAs a veteran HVAC service tech, you know that combustion performance starts with precise fuel metering. The York S1 029 20423 042 #42 Natural Gas Burner Orifice is a genuine OEM York furnace part engineered specifically for technical compatibility with residential and commercial heating units. This #42 drill size orifice is factory calibrated to deliver approximately 25,000 BTU hr per burner at standard 3. 5" w. c. manifold pressure, ensuring stable