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A cat flap allows you to allow your pet to roam more freely while avoiding the headache of having to let them in and out. It will also make your pet less stressed and stop them from entering the home when they are not welcome. 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 panel. Make sure the line is level with a spirit level. 1. The type of door It is best to consult an expert to install a cat flap in an uPVC or double glazing glass seale