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Identifying Door Hinges For uPVC Doors uPVC doors increase energy efficiency and reduce drafts. They are a popular choice for homes. But, tend to fall over time and require regular maintenance. This guide will show you how to determine the hinges on your door and adjust them using an Allen key. UPVC hinges can be adjusted to ensure that the door is perfectly aligned with the frame. The adjustment screws are situated inside the hinge body. Butt Hinges Butt hinges are designed to allow for simple installation