Holmes 9” Twin-Blade Digital Window Fan makes cooling your home a breeze. Designed for double-hung and slider windows, this dual-blade fan includes 2 built-in expandable extender panels to ensure a custom fit from 23.5” to 35.5”. The electronically reversible airflow blades let you switch between fresh air intake, hot air exhaust, or both at the same time for optimal ventilation. Three speed settings allow you to customize airflow, reaching up to 14.4 ft./sec. high-speed velocity. A water-resistant motor ensures durability in rainy conditions, while the remote control provides added convenience for operation from a distance. Includes 2 sturdy feet for tabletop or floor use outside of the window frame. ETL certified for safety compliance.