Holmes 9" Twin-Blade Digital Window Fan makes cooling your home a breeze. This dual blade fan is conveniently designed to fit most double-hung and slider windows and includes 2 built-in expandable extender panels for a custom fit as needed from 23.5" to 35.5". The electronically reversible airflow blades can bring fresh air inside, exhaust hot air out or exchange both simultaneously. It features 3 speed settings, low, medium and high, to adjust your airflow and a high-speed 14.4 ft./sec. velocity. For added convenience, it includes 2 sturdy feet to allow for tabletop or floor use outside of the window frame. Designed to keep a cool breeze in any room, it works great in living rooms, kitchens, bedrooms, and home offices. Features a remote control, white finish, 3-year limited warranty and is ETL certified.