The Air King 9935 14 Inch Window Floor Fan can be used in a window or on the floor so that fresh air is always directed to the right location. The 9935 includes these advanced features: 3 Selectable Speeds: There are 3 speeds to select for perfect cooling every time. Manually Reversible: Can be set for air intake or exhaust depending on your specific needs. Powerful Construction: Features a 14 inch propeller and 5 blades for powerful cooling when you need it. Window or Floor Use: Can fit windows that are 18.5 inches in width and height and can be placed in front of a window screen. Can also be used as a powerful floor fan.