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Introduce your cat to the flap before it's installed so they can be familiar with the size and shape. The flap should be opened and let your cat explore it from every angle. Make sure the cutout is even and square. Mark the screw holes on your door and align them with the opening of the cat flap The distance between the edges must be the same. Preparation Installing a cat flap inside your home is beneficial to the well-being and health of your pet. This is because it will allow the pet to move freely between in