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Why Door Hinge Replacement Is Essential For a Secure Conservatory Hinges are essential to ensure a strong, secure door that is able to function effectively to reduce the risk of draughts. But they require regular maintenance and adjustment to function properly. Most uPVC door frames are fitted with flag hinges. One is attached to the edge or the profile of the door sash while the other is fixed on the frame. They can be adjusted laterally and vertically in order to accommodate the movement of the door sash.