Features: 1. Exhaust fan can increase the air exchange rate, accelerate indoor and outdoor ventilation, and ensure the circulation of indoor ambient air. 2. The motor adopts an all-copper high-energy and high-quality oil-containing bearing motor, which runs smoothly and has low noise. 3. Spiral 3 fan blades, strong suction, quickly sweep away moisture, oil smoke, odor, etc. 4. With automatic closing check valve to prevent odor, wind, dust and rain. 5. Suitable for kitchen, bathroom, bedroom, shop, hotel, restaurant, basement, etc. .