The thermostat fan can be controlled by using the Alarm.com app or Alarm.com customer website and setting the fan to Auto, 1 hour, 2 hours, 3 hours, 24 hours, Indefinite, or Circulate. Example: If the...The thermostat fan can be controlled by using the Alarm.com app or Alarm.com customer website and setting the fan to Auto, 1 hour, 2 hours, 3 hours, 24 hours, Indefinite, or Circulate. Example: If the circulation time is 10 minutes and the duty cycle is 25%, the fan is on for 2.5 minutes and then off for 7.5 minutes until the next cycle. The default Fan Duty Cycle is 25%. This is the percentage of the circulation time period the fan is on.