https://elearnportal.science/w....iki/Cat_Flap_Install
A cat flap lets you to allow your pet to roam more freely while saving you the hassle of having to let them in and out. It will also make your pet less stressed and prevent them from entering the home when they aren't welcomed. To install a cat flap inside your door, measure from the bottom of their stomachs to the floor and draw an outline on the door panel. Check that the line is level with the spirit level. 1. The type of door If you are fitting an animal flap onto the uPVC door panel or a double glazing