180222 Suburban Bruner Orifice #51

NT-34 M S SP NT-35K SF-35 35F 

OEM #51 LP Gas Orifice for 34k–35k BTU Suburban Furnaces

The Suburban 180222 Burner Orifice meters the precise LP gas flow into the burner tube on NT‑34 and SF‑35 furnace platforms. Sized at #51, this orifice is calibrated for the BTU output of the 34k–35k BTU class Suburban furnaces, ensuring proper ignition, stable flame shape, and clean combustion. Using the correct orifice is essential for maintaining furnace efficiency and preventing yellow flames, soot buildup, or ignition failures.

This is the OEM replacement for NT‑34 M/S/SP, NT‑35K, and SF‑35/35F burner assemblies.

Key Features

• OEM Suburban #51 burner orifice

• Provides correct gas flow for 34k–35k BTU furnace platforms

• Ensures proper flame shape, ignition reliability, and combustion stability

• Brass construction for clean, consistent metering

• Direct‑fit replacement for factory burner assemblies

When Technicians Replace This Orifice

• Yellow, lazy, or unstable flame

• Soot buildup in burner or exhaust

• Furnace failing to ignite or lighting inconsistently

• Incorrect BTU output or weak heating

• Orifice clogged with debris, oil, or contamination

Compatibility

NT‑Series Furnaces:

• NT‑34M

• NT‑34S

• NT‑34SP

• NT‑35K

SF‑Series Furnaces:

• SF‑35

• SF‑35F

Fits OEM Suburban burner assemblies requiring a #51 orifice.