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A cat flap lets you to give your pet more freedom without the hassle of having to let them out and in. It will also make your pet to feel less stressed and stop them from entering your home when they're not wanted. To install a cat flap, measure the distance from the bottom of the cat's stomach down to the floor. Draw a line along the door panel. Make sure the line is level with a spirit level. 1. The type of door If you're installing the cat flap to an uPVC door panel or double glazing glass sealed un