York S1-9951-0861 Gas Orifice

The York S1-9951-0861 #44 Gas Orifice is a high-precision LP gas conversion component engineered specifically for York heating systems. This OEM replacement orifice features a #44 drill size with a 0.0860-inch diameter, precisely calibrated to regulate liquid propane flow at 11.0 inches Water Column (W.C.). Designed for robust performance in multi-stage gas furnaces and boilers, this part ensures stoichiometric combustion to prevent soot buildup and inefficient fuel consumption. By maintaining the correct BTU/hr burner rating—approximately 51,600 BTU/hr depending on manifold pressure—it provides the exact fuel-to-air ratio required for safe atmospheric burner operation. For professional contractors, utilizing this genuine York furnace part is critical for maintaining equipment certification and ensuring reliable ignition sequences in high-efficiency LP applications. Its brass construction offers superior thermal resistance and consistent bore dimensions, making it the standard choice for localized furnace gas orifice replacement and system maintenance.

• Engineered Precision: Features a standardized #44 drill size (0.086") for accurate propane flow regulation.
• OEM Compatibility: Authentic York S1-9951-0861 part ensures seamless integration with Coleman, Luxaire, and York burners.
• Optimized Combustion: Designed specifically for LP gas systems to prevent improper flame characteristics and carbon monoxide risks.
• Industrial Durability: Machined from high-grade brass to withstand high-temperature environments without orifice deformation.
• Burner Balance: Maintains the specific manifold pressure requirements for 11" W.C. propane configurations.

What is the BTU rating for a #44 LP orifice?
A #44 orifice typically flows approximately 51,600 BTU/hr when supplied with LP gas at a standard 11.0" W.C. manifold pressure.

Can I use this orifice for natural gas applications?
No, this part is strictly calibrated for the density and pressure requirements of LP gas. Using LP orifices for natural gas will cause significantly under-fired burners and poor heating performance.

Is the S1-9951-0861 compatible with all York furnaces?
While common in many York propane conversion kits, compatibility depends on the specific burner BTU requirements and the manifold design of your unit. Always verify the part number against the equipment's data plate.

Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.