The green island wind switching fan (ventilatingfan) is electrically driven by wind-leaf rotations, with air-regulating appliances of the type exchanged for indoor and outdoor air. Also called a fan. Ventilating fan (ventilatingfan) is electrically driven by wind-leaf rotation, a type of air-regulating appliances that exchange indoor and outdoor air. Also called a fan. The purpose of the air exchange is to remove the indoor air pollution and to regulate temperature, humidity and sensory effects. Air-changing fans are widely used in homes and public places. First, the purchase of an air-changing fan needs to know what it wants to buy. In general, air-switching fans have five uses: they can quickly remove the bad smell left in the bathroom and kitchen; second, you can remove the sulfur and heat and refuel the air from the outside so that the interior is comfortable and cool. Quickness; third, removal of dust and ash from walls and furniture; fourth, rapid removal of moisture from the ...