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Professionals should be responsible for the installation of a cat flap on your door panel. These doors are usually made of a plastic exterior, which is then bonded to an insulation-enhancing, soft polystyrene base. These materials can be hard to cut. It's much simpler to install a cat flap into the glass pane that is already in place or have a brand new door manufactured with the hole already prepared. A glazier can be in a position to assist you.