Lasko's 16" window fan with EZ-Dial ventilation provides whole-house ventilation with an electrically reversible intake and exhaust motor. The Storm Guard feature allows you to close the window for weather protection and peace of mind. The expanding side panels provide a safe, custom fit for most windows (double hung, casement or sliding).. Whole-house cooling power. Exclusive Storm Guard enables the window to be closed behind the fan. Electrically reversible with 3 intake and 3 exhaust speeds. Let fresh air in and exhaust the heat out. Energy-efficient, quiet performance. Side expander panels for a safe, custom fit. Lightweight and easy to mount. Fits windows 26.5 in. to 34.5 in. wide and 22 in. high or larger. ETL Listed. Patented Safety Fuse technology. Easy-to-use manual controls. Fully assembled. <a href=https://www.homedepot.com/c/electronics_recycling_programs style=color:#F96302 target=_blank>Click here for more information on Electronic Recycling Programs</a>. Width (in.): 8.25 in. Fan diameter (in.): 16 in. Height (in.): 22 in. Number of Window Fans: Single Fan. Power Type: Plug-In. Window Type: Double Hung. Number of Fan Speeds: 3 Speeds. Fan Features: Storm Guard