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A cat flap lets you to allow your pet to roam more freely while saving you the hassle of having to let them out and in. It can also make your pet less stressed and prevent them from coming into the home when they're not welcomed. To set up a cat flap take a measurement of the distance from the bottom of the cat's stomach to the floor. Mark a line along the door's panel. Verify that the line is level with a spirit level. 1. The kind of door If you are fitting the cat flap to a uPVC door panel or a double glazing glass