A casement window is usually attached with one or more than one hinges to its frame. Normally the casement windows rotate around their fixed axis that you normally placed at the sides of the window from both top and bottom of the window. You can either find a single casement window or a pair of them which will open on the outside in that case, before the introduction of the sash windows the casement windows where the ones that were most commonly used in different households all around the world. These casement windows usually opened towards the outside of the house.
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