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https://chessdatabase.science/....wiki/Cat_Flap_Instal
Professionals should handle the installation of a cat flap onto your door panel. The doors are typically made from a thin, plastic exterior that is bonded to an insulate, soft polystyrene core. It isn't easy to cut through these materials. It is much simpler to install the cat flap inside an existing glass pane, or to have the hole drilled for a new door. A glazier is in a position to assist you. Easy to fit Upvc door panels are a great option if you have a cat at home and would like to allow it to enter and out of your home