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A cat flap lets you to allow your pet to roam more freely while avoiding the hassle of having to let them in and out. It will also make your pet less stressed and prevent them from entering your home when they aren't welcomed. To put up a cat flap, measure the distance from the bottom of the cat's stomach down to the floor. Mark a line along the door's panel. Check that the line is level with the spirit level. 1. The type of door If you are installing an animal flap onto the uPVC door panel or a double glazi