Why is the valve failing to close

this Goodman furnace vent adapter maintains structural integrity under constant thermal cycling

This is a standard three-wire application

Direct Fit Replacement: Maintains the OEM specifications for Emerson Alco hardware

Lennox 11U65 Pressure Switch 320734-701 Why is the valve failingThe Lennox 11U65 Pressure Switch is a critical safety component engineered for precision monitoring of combustion air in high efficiency furnace systems. This OEM Lennox replacement part, also identified by manufacturer number 104371 02, is a high sensitivity 60" wc pressure switch designed to actuate at exactly 0. 60 inches water column. Operating as a normally open SPST switch (Single Pole Single Throw), it ensures that the inducer motor is creating