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Understanding the Different uPVC Door Hinge Types Understanding the distinctions between the three types of uPVC hinges is crucial when replacing them. This will help you understand how to adjust your door and get it shut correctly. Flag hinges are available on a variety of newer uPVC door models. They provide the best control to adjust the position of your door. These can be moved both vertically and laterally. Flag Hinges In the course of time, due to continuous use, closing and opening of the door,