https://sciencewiki.science/wi....ki/Choosing_Cat_Flap
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Installing a cat flap on your door panel is an essential task to be handled by an expert. These doors are usually made of a thin plastic exterior, which is then bonded to an insulate, soft polystyrene core. These materials can be difficult to cut. It is much easier to fit the cat flap on an existing glass pane, or have the hole prepared for a new door. A glazier is able to do this for you. Easy to install If you have a cat and want to let them in and out wit