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A cat flap allows you to allow your pet to roam more freely while saving you the headache of having to let them in and out. It can also help your pet to be less stressed and prevent them from entering the home when they're not welcome. To install a cat flap take a measurement of the distance from the bottom of the cat's stomach to the floor. Draw a line across the door's frame. Make sure the line is level using the spirit level. 1. The kind of door If you are installing the cat flap to the uPVC door panel or double