Close the UPVC-paneled door and secure the lock to avoid any accidents during the process.
Inspect the door for the manufacturer's tag, stamp or badge attached to it. Read the information provided on the badge for the type of panel used.
Contact the manufacturer to inquire about the type of panel used on your door. Provide any necessary details as found on the door tag.
Contact an expert from a UPVC door manufacturing firm if there is no tag attached to any part of the door. Have them inspect and identify the type of panel used. You could also contact a local outfit firm specializing in UPVC door maintenance for an expert opinion on the sort of panels used.
Take digital pictures of your UPVC-paneled door with a digital camera. Send them to a local building firm to assist you with the type of panel fitted in your door.