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Understanding the Different uPVC Door Hinge Types When replacing uPVC hinges, it is important to understand the difference between the three types. This will allow you to understand how to adjust your door to make it close correctly. Flag hinges are available on a variety of newer uPVC door models. They provide the best control to adjust the door's position. They can be moved both laterally and vertically. Flag Hinges Over time from constant use, opening and closing of the door it's quite normal for you