Sharper Image creates cutting-edge products - so when we set out to create a window fan, we did our research and then rewrote the formula. The result was just over 6" tall, unobtrusive, and clever enough to be seamlessly installed in windows from 24" up to 38" wide using an innovative modular block system. At only 6.5" tall, Portal doesn't block your view. In today's world full of ugly, repetitive window fans, Portal is a window fan that lives up to the Sharper Image vision.