They belong to the same group as casement windows except usually they are wider than they are tall and are hinged along the sides of the frame and crank open from the bottom. Very modern, very versatile, no restrictions on ratio between width and height. These windows are best suited for wider and shorter openings and can be positioned above or below any window or door to add height or can be used alone or in vertical or horizontal groups to create a wall-lite effect and at the same time increase air circulation and light without compromising on privacy. Scissor arm rotor gear operators provide effortless opening and closing. Sash lock provides extra security and ensures a tight fit to the weather-stripping. Heavy duty concealed hinges provide trouble free operation and allow cleaning from the inside.