Lennox 54M90 Orifice 321042-401 40 Cv flow factor remains

40 Cv flow factor remains consistent after installation

you typically require the -501 variant

Industrial Durability: Built to withstand commercial environments

reducing service call duration and improving long-term reliability

This unit is built to withstand high-volume flow conditions and is rated for a maximum working temperature of 250

Lennox 54M90 Orifice 321042-401 40 Cv flow factor remainsThe Lennox 54M90 LP Orifice is a critical metering component designed for precise gas to propane conversion in compatible Lennox heating units. Engineered for durability and high tolerance performance, this 0. 034 inch orifice ensures steady pressure regulation and fuel flow, preventing common combustion issues such as soot buildup or irregular flame patterns. For contractors performing a Lennox furnace LP conversion, using OEM spec orifices is