UPVC Casement Window

casement window, earliest form of movable window, wood or metal framed, with hinges or pivots at the upright side of the vertically hung sash, so that it opens outward or inward along its entire length in the manner of a door. One frame, separately movable, of such a window is called a casement sash.Double-hung windows generally have screens attached on the outside, while casements have the screen attached inside to allow the window to swing open while keeping the opening covered by the screen.