This is a new Fan Control Thermostat for Wood, Pellet, Insert, and Gas Fireplace Blower. 

This is an adjustable thermostat 

and is easily set for the desired temperature range 

from 90 degree F to 130 degree F by turning the indicator dial built into the control.

 Also, it has an adjustable thermostat features integral 2 hole oval mounting flanges. 

Fan will turn on to the temperature you set it as, 

and will automatically turn off below 20 degree F.