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A cat flap is a great method to allow your pet freedom and ease the burden of having them go in and out. It will also help your pet to feel less stressed and keep them from entering your home when they are not wanted. To set up a cat flap, measure the distance from the bottom of the cat's stomach down to the floor. Mark a line along the door's panel. Utilize a spirit-level to ensure that the line is straight. 1. The kind of door If you're installing a cat flap into an uPVC door panel or double glazing glass sealed unit, it is often