The exhaust fan back panel adopts hexagonal grid pattern,which is durable and easy to use. The glass glue 45 inclined grid waterproof cap is detachable and washable,and the rubber pad has the function of shock absorption and noise prevention. 260m3/h large air volume and fast exhaust,giving you a fresh and comfortable home The fan's frame and blades are made of highly flame-retardant ABS plastic,which is resistant to high temperatures,has high efficiency and long service life. Specifications: 4-inch,15W,98m3/h,38dB(A); 6-inch,25W,210m3/h,40dB(A); 8-inch,22W,260m3/h,43dB(A) The front shutter of the ventilation fan can effectively prevent foreign objects from entering the room,prevent the backflow of outdoor air,keep the indoor air fresh,and automatically close after power failure