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A cat flap is an excellent method to allow your pet the freedom to roam and ease the burden of getting them out and in. It will also make your pet to feel less stressed and keep them from entering the house when they're not needed. To set up a cat flap, measure the distance from the bottom of the cat's stomach to the floor. Draw a line across the door's panel. Use a spirit-level to check that the line is straight. 1. The type of door If you are fitting a cat flap into a uPVC door panel or double glazing glass sealed unit i