The 16" electrically reversible window is designed with slide panels on each side to custom fit a window that is 26-1/2" - 34-1/2" wide and no less than 22" high. The ability to simply turn a knob to control the intake or exhaust flow of air provides you with the power to conveniently control your own comfort with three quiet speeds. Pull the air in on cooler days or exhaust the hot air out when needed. This fan comes equipped with a storm guard feature. This feature allows the fan to be mounted in a way that allows the window to close behind it; protecting your home and belongings Lightweight and easy to mount. ETL Listed. 1-year limited warranty. Energy-Efficient, quiet performance. Light Gray.