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A cat flap is a great way to give your pet the freedom to roam and avoid the hassle of letting them in and out. will also help your pet be less stressed and prevent them from escaping the house when they are not wanted. To install a cat flap on your door, measure from the bottom of their stomachs to the floor and mark an outline on the door panel. Use a spirit-level to check that the line is straight. 1. The kind of door If you are installing the cat flap to a uPVC door panel or double glazing glass sealed unit it is often best to contact an expert w