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A cat flap is a great way to give your pet freedom and save you the hassle of getting them out and in. It will also help your pet be less stressed and keep them from escaping the house 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's frame. Use a spirit-level to check that the line is straight. 1. The type of door If you are fitting the cat flap to an uPVC door panel or a double glazing glass sealed unit it is usua