#W16900, 16" Window fan with E-Z Dial Ventilation 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, energy-efficient quiet performance, side expander panels for a safe custom fit, lightweight and easy to mount, fits windows 26-1/2" to 34-1/2" wide and 22" high or larger, patented safety fuse technology, ETL listed and Made in the USA with domestic and imported parts.