When you are on a service call for a commercial fan coil unit or industrial air handler

this valve ensures a secure

Common causes include blocked vents

greenhouses

particulate

Lochinvar & A.O. Smith 100112350 Burner Assembly 321042-401 When you are on aThe Lochinvar & A. O. Smith 100112350 Burner Assembly is a precision engineered OEM replacement burner designed for high recovery commercial water heaters and atmospheric boilers. This 18 inch natural gas burner assembly comes factory equipped with a #39 orifice, ensuring the specific BTU input and manifold pressure requirements of the manifold are met without field modifications. As a direct replacement for Lochinvar and A. O. Smith heating systems,