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A cat flap is an excellent option to give your pet some freedom and avoid the hassle of having them go in and out. It can also help your pet be less stressed and keep them from entering the house when they're not wanted. To put up a cat flap, measure the distance from the bottom of the cat's stomach down to the floor. along the door's frame. Make use of a spirit-level for checking that the line is straight. 1. The kind of door If you are installing a cat flap into the uPVC door panel or a double glazing glass sealed unit, it is usually best to talk