1. Enclosed high-efficiency motor, no rust or oil leakage 2. The upgraded power cord comes with an independent switch for easy operation. 3. Safe front and rear grilles, difficult for fingers to insert (single front grille/front and rear grilles optional) 4. Large air volume, high speed, metal body, cast iron 4 fan blades 5. Meet various ventilation requirements, suitable for home/commercial use, living room/restaurant/shop/office/chess and card room/kitchen/bathroom/supermarket/factory workshop, etc. 6. When used as a kitchen exhaust fan, it can quickly eliminate oil fumes; when used as a bathroom exhaust fan, it can quickly remove moisture and odors; when used as a home ventilator, it can remove dirty air and keep indoor air fresh.