Air vents are activated when the three-speed switch is turned to any of the three speed selections. The dome cover is opened when the dome up switch is activated and closed when the down feature of the switch is selected. To activate the fan blade, the built-in thermostat must be turned to a temperature selection, which is lower (cooler) than the current interior temperature. Once the selected temperature is attained, the fan blade will shut off, but the dome will remain open until the down feature is selected or the built-in rain sensor becomes wet. Once the sensor dries, the dome will re-open.
Fan-Tastic Camper Air Vent Fans have a two-year limited warranty (lifetime warranty on exterior dome) against defects in materials and workmanship when installed and operated according to instructions