https://articlescad.com/how-mu....ch-to-install-a-cat-
A cat flap is a great option to give your pet the freedom to roam and save you the hassle of getting them out and in. It can also help your pet to feel less stressed and keep them from entering the house when they're not needed. To place a cat flap inside your door take a measurement from the bottom of their stomachs to the floor, and draw a line on the door panel. Make sure the line is level using the spirit level. 1. The type of door If you are installing an animal flap onto a uPVC door panel or a double glazing glass