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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 kinds. This will allow you to understand how to adjust the door to allow it to close properly. Flag hinges are available on a variety of newer uPVC door models. They provide the most effective control to adjust the door's position. These can be moved both lateraly and vertically. Flag Hinges It is normal for the hinges on your uPVC doors to become loose as time passes due