Lennox 31J91 LP Pilot Orifice

The Lennox 31J91 LP Pilot Orifice is a precision-engineered liquid propane (LP) conversion component designed specifically for residential and commercial gas heating systems. As a critical mechanical replacement for the legacy 31J9101, this red-coded orifice ensures consistent gas flow regulation to the pilot burner assembly, maintaining a stable flame for reliable ignition cycles. Field-tested for durability, the Lennox 31J91 is manufactured from high-grade metal alloys to withstand the thermal stresses found in high-efficiency furnace cabinets. With an outer diameter of 3/8" and an inner diameter of 1/4", this genuine OEM replacement part provides exact tolerances required for safe LP gas combustion. This part is frequently utilized in Lennox G23Q and G26Q furnace series, as well as select models from Allied, Armstrong, and Ducane, providing a precise drop-in fit for contractors refurbishing gas valves and pilot systems in the field.

• Precise Flow Regulation: Engineered for accurate gas metering to the pilot light, preventing lifting or inconsistent flame patterns in LP systems.
• Direct OEM Compatibility: Verified replacement for 31J9101, ensuring HVAC part compatibility without the need for field modifications.
• Enhanced Ignition Reliability: Correct orifice sizing minimizes nuisance lockouts and ensures the thermocouple or flame sensor receives adequate heat.
• Versatile Application: Fits a broad range of Lennox and Allied Air platforms, including residential forced-air furnaces and commercial boilers.
• Rugged Construction: High-quality alloy build prevents orifice erosion and clogging over long-term operation.

Can the 31J91 be used for natural gas applications?
No, this specific orifice is color-coded red and sized exclusively for liquid propane (LP) gas. Using this in a natural gas system will result in insufficient pilot flame and system failure.

Does this orifice include the pilot nut and ferrule?
This item typically includes the LP pilot orifice itself. It is recommended to inspect the existing pilot tubing and fittings during replacement to ensure a gas-tight seal.

Is this part compatible with non-Lennox brands?
Yes, as a cross-platform part, it is a direct replacement for various Allied, Armstrong, and Ducane models using the 31J9101 specification.

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.