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Understanding the Different uPVC Door Hinge Types Understanding the differences between the three types of uPVC hinges is essential when replacing them. This will allow you understand how to adjust the door and make it close correctly. Flag hinges are commonly found on the latest uPVC doors and provide the greatest control when it comes to changing the door's position. They can be moved vertically and laterally. Flag Hinges In the course of time, due to continuous use, the opening and closing of the door