This SKU covers the 187mm insulation disk only

this open-board controller is factory-configured with a specific 26K Ohm sensitivity

or an oversized furnace for the ductwork

Rugged Build: Constructed to withstand the cycling and thermal stress of commercial unit heater applications

Carrier HH12ZZ185 Limit Switch 30067439-890 This SKU covers the 187mmThe Carrier HH12ZZ185 Limit Switch (part number L185F 40) is a critical OEM HVAC replacement part designed for high limit thermal protection in furnace and air handling units. This normally closed (NC) switch functions as a primary safety mechanism, monitoring internal temperatures to prevent heat exchanger damage. It features a fixed set point that opens the electrical circuit when temperatures reach 185F and automatically resets once the system