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Understanding the Different uPVC Door Hinge Types Understanding the differences between the three main types of uPVC hinges is crucial when replacing them. This will allow you to understand how to adjust your door and get it shut properly. Flag hinges are typically found on newer uPVC doors and provide the greatest control when it comes to changing the positioning of your door. These can be moved both lateraly and vertically. Flag Hinges Over time from continuous use, closing and opening of the door it's