Pella Impervia fiberglass awning windows are made from the strongest material for windows, engineered for lasting durability. Awning windows are hinged at the top and vent open from the bottom. Our revolutionary Easy-Slide Operator allows you to open and close your windows by sliding the operator side to side, without a crank. The simple, revolutionary design means you’ll never have to endure a window crank again. With a timeless design and simple features and options, Pella Impervia awning windows complement any project style.