Fresh Air Circulator Timer Wall SwitchThe Enerlites DWTS is an automated timer wall switch for an air circulating fan. The fresh air fan control offers both a countdown timer and a minutes per hour (MPH) timer. The countdown timer can be set anywhere from 5 60 minutes, and it activates when the fan is manually turned ON. The MPH timer recognizes when the fan was last used and automates it for a pre selected amount of time after each hour that it is OFF. The MPH timer can be easily