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Professionals should be responsible for the installation of a cat flap on your door panel. These doors are typically constructed of a thin plastic exterior that is bonded to an insulation-enhancing, soft polystyrene base. These materials can be hard to cut. It's a lot easier to put the cat flap inside an existing glass pane, or have a new door made with the hole already prepared. A glazier is capable of doing this for you. Easy to install If you have a