Lennox 51M91 Gasket 321042-401 the regulator must be field-adjusted

the regulator must be field-adjusted to 2

Always verify the part number against your model’s technical data sheet to ensure the motor can handle the static load

requiring no external wiring

This signifies that the switch will open (break the circuit) at 145°F to stop the burners and close (completed circuit) once the temperature drops to 105°F

Key Benefits Precise Calibration: Factory-set at

Lennox 51M91 Gasket 321042-401 the regulator must be field-adjustedThe Lennox 51M91 Blower Gasket is a critical high temperature seal designed specifically for Lennox furnace blower assemblies and 4 inch inducer motor housings. Engineered to withstand the thermal cycling inherent in high efficiency HVAC systems, this 4 inch blower gasket ensures an airtight seal between the blower housing and the furnace cabinet, preventing bypass air and maintaining static pressure integrity. This OEM replacement component is vital