The Bionaire Manual Thin Window Fan transforms warm, static air with a balance of cooling relief and gentle exhilaration. This manual window fan disperses invigorating, revitalizing coolness for maximum comfort and freshness. Lifeless air dissipates to breaths of nourishing air and the renewing effects of cooler air become more present in your surroundings. It is more powerful with 40% greater air velocity compared to similar window fans and 25% more compact to reduce window obstruction. With Bionaire brand technology, you can live in harmony with nature for a serene home environment. More powerful and more compact, 3 independently controlled comfort settings, 3 speed settings, Designed for vertical or horizontal configurations, Manual controls, Patented locking extender screens.