Lennox 27M18 Orifice R-407A The TWIN model is the

The TWIN model is the panel-only version

and a 48-frame size

A: The switch is rated at 22/50 PSI

The 510-811-222 includes the burner

depending on the damper blade seal friction and air velocity specifications

Lennox 27M18 Orifice R-407A The TWIN model is theThe Lennox 27M18 Orifice is a precision engineered 052 sized flow control component essential for maintaining the manifold pressure and combustion efficiency of Lennox commercial and residential heating systems. Designed as a direct OEM replacement part, this orifice (MPN: 27M18, replaces LB 99225) ensures accurate gas metering for Lennox T Class rooftop units and gas furnaces, specifically compatible with models including KGA036S4, KGA092, and LGH180