The 16" Electrically Reversible Window Fan powerfully circulates air through two to three rooms. Plus its exclusive Storm Guard feature allows you to close the window behind fan for safety and security during inclement weather or while you're away. Three Whisper-Quiet Speeds. Powerful 16" Three-Paddle Blades. Electrically Reversible Motor with a Simple Turn of the Dial. Fits Windows 26" to 34" Wide and 22" High and Larger. U.L. Listed.