1.Easy Installation. 2.Low Noise Operation. 3.Built-in Thermal Safety Fuse. 4.Multi-applications. 5.CE,CB,ROHS Certificates. Wall Mounted Bathroom Ventilation Fan:1.Elegant & Compact Design.2.Exquisite Anti-reflux Damper.3.Window, Wall & Glass Mounted Applications.4.Easy for Installing and Maintenance.