Fan-Tastic Vent 803350, Polar White Garnish w/Smoke Dome

With Dome Closing Sensor & Built-In Thermostat. By presetting the built-in thermostat, the dome cover opens automatically and the fan begins operating. When the thermostat has been satisfied the dome cover automatically closes and the fan shuts off, completely eliminating manual operation. A built-in solid state rain sensor automatically closes the dome cover during heavy down pours and allows it to re-open once the rain has stopped.