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Professionals should handle the installation of a cat flap onto your door panel. These doors typically consist of the plastic exterior, which is thin and flimsy, and then that is bonded to a soft insulating polystyrene core. These materials can be hard to cut. It's much simpler to install the cat flap inside the glass pane that is already in place or have a brand new door made with the hole already prepared. A glazier can be capable of doing this for