The 03-101-01 is ATM's simplest thermal switch, it must be mounted near the heat source. The fan will turn on when the temperature at the switch reaches the temperature the knob is set to, and turns off when the temperature is 10 degrees lower. Mounts in a standard AC junction box.
All ATM thermal switches install by plugging them into any AC outlet and simply plugging the System 1 blower into them.