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A cat flap lets you to allow your pet to roam more freely while avoiding the headache of having to let them out and in. It will also make your pet less stressed and stop them from coming into the home when they are not allowed to do so. To install a cat flap take a measurement of the distance from the bottom of the cat's stomach down to the floor. Mark a line along the door's frame. Make sure the line is straight using the spirit level. 1. The type of door If you are fitting a cat flap into a uP