Features: The exhaust fan is made from plastic, It can stands up to everyday wear and tear, guaranteeing lasting performances. Featuring a quiet ball bearing motor (<34 ) and strong plastic housing with IPX4 waterproof rating, this ventilation fan ensures stable performances in humid environments. The check gate automatically opens during operate and closes when stopped. Low noise, easy to use. Its integrated shutter stop intrusion and blocks external cold/moist air infiltration, making this bathroom ventilation fan a strong , low maintenance upgrade for any residential or commercial space. The exhaust fans can be conveniently installed in locations such as garages, workshops, chicken coops, sheds, attics, greenhouses, offices, hospitals, and theaters, suitable for both indoor and outdoor, residential and commercial use. Specifications: Component: Plastic Size: about 10x10cm/3.94x3.94inch Input voltages: 110v Package Includes: The backflow flap ensures that none cold or damp air penetrates from the outside through the switched off fan. Ideal for wall mounting. note: Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. Due to the difference between different monitors, the picture may not reflect the actual color of the item.