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A cat flap allows you to allow your pet to roam more freely while saving you the hassle of having to let them in and out. It can also help your pet be less stressed and stop them from entering your home when they are not wanted. To fit a cat flap in your door you need to measure from the bottom of their stomach to the floor and draw an outline on the door panel. Use a spirit-level to check whether the line is straight. 1. The type of door If you are installing an animal flap onto an uPVC door panel