As a genuine factory-sealed part

it ensures proper fitment and resistance values within the furnace's control circuit

For high-temperature steam applications (up to 15 psig)

It must be used to switch a relay or contactor coil rather than the primary heating element load directly

Resideo L4064B2210 Controller 30067439-890 As a genuine factory-sealed partThe Resideo L4064B2210 Fan and Limit Controller is a critical component for regulating forced warm air heating systems, providing integrated control over blower motor activation and high limit safety protocols. This universal furnace fan limit switch features an 11. 5 inch element insertion length, making it ideal for large plenum applications where accurate temperature sensing is required. Engineered for reliability, the switch logic ensures the fan