this valve is specifically calibrated for Propane (LP) at 10" WC

as these cause ignition failure

Broad Compatibility: Drop-in replacement for Lennox EL280

use a manometer to verify the actual draft

and thermal function

Reznor 120153 Orifice 321042-401 this valve is specifically calibratedThe Reznor 120153 Orifice is a precision engineered #20 burner orifice designed specifically for maintaining consistent gas flow and combustion efficiency in industrial heating systems. As an authentic Reznor replacement part, this 1 2" burner nozzle features a durable steel body with an NPT connection, ensuring a leak proof seal and long term reliability under high thermal stress. For contractors servicing Reznor unit heaters or duct furnaces,