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Identifying Door Hinges For uPVC Doors uPVC doors improve energy efficiency and reduce draughts. They are popular for homes. However, they do tend to decrease over time and require regular maintenance. This guide will show you how to identify the hinges on your door and adjust them using an Allen key. UPVC hinges are adjustable to ensure that the door is aligned and fits the frame. The adjustment screws are located within the hinge body. Butt Hinges Butt hinges are designed to allow for simple installatio