Our casement windows have a sash that swings out horizontally, secured tightly with a multipoint locking system.Between the main frame and sash, there is a brush seal that is used to keep dirt and dust off the sill. Just past the brush seal there are two bulb seals that are used to create suction between the sash and the main frame in order to prevent water and wind from coming into the home. They swing outward, for maximum ventilation and unlike sliding or hung windows, casements don’t have a rail. They open using a smooth action hand crank that folds away to maintain sleek window lines and won’t interfere with your window coverings. With easy operation and optimal thermal performance, these windows are practical and beautiful. These features make them the most popular style of window on the market today.