This snap disc control switch is used to turn the power OFF/ ON to the convection room air blower on many pellets, wood and gas stoves, fireplaces, and inserts made by QuadraFire.
Snap Disc #1 (Convection Blower) 145°F-20 Snap disc #1 is located on the right side of the appliance on the top of the heat exchanger box. There are 2 purple wires connected to it. This snap disc turns the convection blower on and off as needed. Power is always present at snap disc #1.