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A cat flap is a great method to allow your pet the freedom to roam and ease the burden of letting them in and out. It will also make your pet less stressed and prevent them from coming into the home when they're not welcome. To set up a cat flap take a measurement of the distance from the bottom of the cat's stomach down to the floor. Draw a line along the door's panel. Verify that the line is straight using an ad hoc level. 1. The kind of door If you're installing an animal flap onto the uPVC door panel or a double glazing glass sealed unit, it is