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.