Reznor 11831 Orifice

The Reznor 11831 Orifice is a critical OEM replacement part designed for precision fuel regulation in gas-fired heating systems. This brass gas orifice plug is specifically sized as a #35 natural gas orifice, ensuring the exact manifold pressure and BTU input required for optimal burner performance. In the field, installing the correct unit heater orifice is the difference between a clean, efficient burn and dangerous overfiring or soot accumulation. This component is engineered to withstand high-thermal cycles while maintaining a consistent gas flow rate through its precision-drilled aperture. It is compatible with a wide range of Reznor equipment, including the F series units (F-165, F-200, F-250, F-300, and F-400), making it a versatile staple for any service truck. When troubleshooting irregular flame patterns or ignition lockouts, verify the orifice size and ensure no debris is obstructing the port. This genuine Reznor HVAC part ensures the appliance operates within its factory-specified parameters for safety and efficiency.

• OEM Precision: Guaranteed #35 drill size for accurate natural gas metering and consistent BTU output.
• Industrial Durability: Machined from high-grade brass to resist corrosion and thermal degradation in the burner manifold.
• Broad Compatibility: Direct fit for Reznor F-165 through F-400 models, reducing inventory needs for commercial contractors.
• Enhanced Combustion: Supports ideal air-to-fuel ratios, preventing carbon monoxide buildup and heat exchanger fatigue.

What happens if I use the wrong orifice size?
Installing an orifice larger than #35 for a system rated for this part will lead to overfiring, which can crack the heat exchanger. Conversely, a smaller orifice will result in underfiring and poor heat rise.

Can I use this orifice for Propane (LP) conversion?
No, this is a natural gas orifice. LP requires a different orifice size (usually much smaller) and a regulator spring kit to handle the higher energy density of propane.

How do I clean a clogged Reznor 11831?
Never use a drill bit or wire, as these can enlarge the #35 opening. Use compressed air or a soft-bristled non-metallic brush to clear dust or spider webs that may be causing "lazy" flames.

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.