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The Lasko 2155A window fan is used to circulate the air through your room. With a simple turn of a dial, this reversible fan can change the air flow direction. You can easily switch between expelling hot air out and drawing cool fresh air in. Exclusive storm Guard feature enables your window to be closed behind the fan for safety and security during storms or when you're away. This fan fits a window that is 26.5" - 34.5" wide and no less than 22" high.