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A cat flap is a great option to give your pet the freedom to roam and avoid the hassle of getting them out and in. It can also help your pet to be less anxious and will stop them from entering your home when they aren't welcomed. To place a cat flap inside your door you need to measure from the bottom of their stomach to the floor and mark a line on the door panel. Verify that the line is level with the spirit level. 1. The kind of door It is recommended to consult an expert to install a cat flap on a uPVC or double glazing