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A cat flap is a great option to give your pet some freedom and ease the burden of getting them out and in. It will also help your pet to feel less stressed and keep them from entering your home when they're not needed. To put 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 frame. Utilize a spirit-level to ensure that the line is straight. 1. The kind of door If you're installing the cat flap to the uPVC door panel or double glazing glass seal