· To improve your efficiency,please carefully check the product size when purchasing· Efficient Work:This bathroom exhaust fan can efficiently eliminate indoor moisture and odors, including steam generated after showering,damp odors after prolonged use, and possible tobacco smoke, ensuring fresh and dry indoor air· Silent design:The quiet bathroom exhaust fan runs at a speed of 110CFM and 1.0 Sones, making the fan extremely quiet during operation and not disturbing your rest or daily activities, enhancing your user experience· Easy Installation:The ultra quiet ventilation fan is suitable for ceiling structures of 8 inches x 8 inches x 5.5inches, compatible with 4-inch ducts,white wire is zero, black wire is fire, green wire is ground and comes with a quick bracket for safe and convenient installation. Installation can be easily completed without the need for professional tools· Super ventilation:This bathroom exhaust fan is made with advanced technology and high-performance spiral centrifugal impellers, which can quickly exhaust the air in the bathroom and introduce fresh air, maintain air circulation in the bathroom, and effectively prevent moisture and odor accumulation· After sales service:We provide 2 year after-sales service. If you have any questions, please feel free to contact us for assistance. We will provide you with professional answers within 24 hours. Customer satisfaction is our service tenet