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Understanding the Different uPVC Door Hinge Types Understanding the distinctions between the three major types of uPVC hinges is essential when replacing them. This will allow you understand how to adjust the door to allow it to close properly. Flag hinges are available on many newer uPVC door models. They offer the best control to adjust the door's location. These can be moved both vertically and laterally. Flag Hinges Over time from frequent use, closing and opening of the door, it's normal for your uPVC door