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Introduce your cat to the flap prior to the installation so that they 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 the door and align them with the opening of the cat flap - the distance between the edges should be the same. Preparation Installing a cat flap in your home is beneficial to the health and well-being of your pet. It will allow your pet to freely move from the inside to the outside,