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A cat flap lets you to give your pet more freedom while avoiding the headache of having to let them out and in. It will also help your pet feel less stressed and stop them from entering your home when they're not needed. To set up a cat flap to install a cat flap, measure the distance from the bottom of the cat's stomach down to the floor. Draw a line across the door's panel. Utilize a spirit-level to ensure whether the line is straight. 1. The type of door If you are fitting a cat flap into an uPVC door