180309 Suburban Bruner Orifice (METRIC THREADS) #50
SF-42 42F (ABOVE SERIAL NO. 021206467) SH-42 42F, SHD2542 SF-42Q 42FQ

The Suburban 180309 Burner Orifice meters the correct LP gas flow into the burner tube on 42k BTU Suburban furnaces. Sized at #50, it is calibrated for the highest‑output Suburban furnace class and ensures proper ignition, stable flame shape, and clean combustion. The metric thread design is used on later‑production furnaces and all Q/FQ variants.

Using the correct thread type is essential—metric and standard orifices are not interchangeable and will not seat correctly in the burner assembly.

Key functions this orifice supports

• Maintains correct LP gas flow for 42k BTU furnace platforms

• Ensures stable flame shape and clean combustion

• Supports reliable ignition and consistent heating output

• Prevents soot, yellow flames, and over‑ or under‑firing

Compatibility

SF‑Series Furnaces:

• SF‑42 (units above serial no. 021206467)

• SF‑42F (units above serial no. 021206467)

• SF‑42Q

• SF‑42FQ

SFVH‑Series Furnaces:

• SFVH‑42Q

• SFVH‑42FQ

SH‑Series Furnaces:

• SH‑42

• SH‑42F

SHD‑Series Furnaces:

• SHD‑2542

This is the correct OEM metric‑thread #50 orifice for all models listed above.