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Proper Installation and Maintenance of a upvc Door Hinge If your uPVC hinges on your doors are not aligned correctly, you might find it difficult to open and close the door correctly or encounter draughts. Luckily, this issue can be fixed by using an adjustment screw, based on the type of hinge. Be sure to work in a safe area and that all tools are handled properly. Adjustment Installing an uPVC door for your home is crucial, but it's also important that they are correctly adjusted to avoid gaps and draughts.