York S1-9951-1491 Orifice

The S1-9951-1491 is a precision-engineered natural gas orifice designed specifically for York, Coleman, and Luxaire burner manifolds. Featuring a #25 drill size with a specialized .1495-inch internal diameter, this component is critical for regulating gas flow to ensure an optimal air-to-fuel ratio during the combustion process. As a genuine OEM York furnace part, it is machined from high-grade brass to withstand the thermal stressors found within the burner compartment while resisting corrosion over extended service intervals. This #25 brass orifice provides the exact flow characteristics required to maintain manufacturer-specified BTU output and flame stability. Technicians should utilize this specific HVAC burner orifice when replacing clogged or damaged components to restore system efficiency and prevent soot accumulation caused by improper gas metering. Proper installation of the York replacement orifice is essential for achieving consistent ignition and reliable heat exchanger performance in residential and light commercial gas-fired furnaces.

Key Benefits

• Precision-machined .1495-inch bore ensures accurate natural gas flow for consistent combustion.
• High-quality brass construction provides excellent heat resistance and structural integrity.
• Direct OEM replacement ensures perfect thread alignment and manifold seating.
• Engineered to maintain strict HVAC burner orifice tolerances for safe furnace operation.

Common Questions

What is the BTU capacity of a #25 natural gas orifice?

The BTU capacity varies based on your specific manifold pressure (typically 3.5" W.C. for natural gas), but a .1495 diameter is designed for high-output burner stages in standard atmospheric or induced draft furnaces.

Is the S1-9951-1491 compatible with Liquid Propane (LP)?

No, this orifice is sized specifically for natural gas. Propane applications require significantly smaller orifice diameters due to the higher energy density and pressure of LP gas.

How do I identify if this is the correct drill size for my furnace?

Always cross-reference the furnace data plate or the service manual. The #25 drill size must match the manufacturer’s specifications for your altitude and gas type to ensure safe operation.

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.