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A cat flap lets you to allow your pet to roam more freely while saving you the burden of letting them in and out. It will also help your pet to feel 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 a line on the door panel. Verify that the line is level with a spirit level. 1. The kind of door If you are installing a cat flap into the uPVC door panel or double glazing glass sea