Advanced Safety: Includes an integrated pressure-sensitive interrupter and meets UL 810 safety standards for internal protection

ensuring the system shuts down if a flame rollout occurs

What happens if I undersize this orifice for my load

and 'FAN' for the condenser fan (5 MFD)

Lennox 10M74 Limit Switch Advanced Safety: Includes an integratedThe Lennox 10M74 Limit Switch is a critical fixed temperature safety control designed for precise thermal monitoring within Lennox residential furnaces. Functioning as a normally closed (NC) switch, this component features a 155F cutout and a 125F reset (155F OUT 125F IN), ensuring the burner circuit opens if plenum temperatures exceed safe operating limits. Also identified by the manufacturing part number 10M7401, this limit control replacement is