A casement window, or a crank-out window, is one of the most popular options for maximum ventilation or egress. They open outwards with a crank attached to the frame/sash. The hinges allow you to open the window a full 90 degrees for optimal fresh air and also for convenient cleaning inside and out. Features a multipoint locking system and single lever to ensure a tight seal.. Available as single, double, triple, or 4 light units. Full screens are included.