https://jackson-mohamad.techne....tbloggers.de/cat-fla
A cat flap allows you to give your pet more freedom while saving you the headache of having to let them out and in. It will also make your pet be less stressed and prevent them from entering your home when they're not needed. To place a cat flap in your door, measure from the bottom of their stomach to the floor and mark a line on the door panel. Make sure the line is straight using an ad hoc level. 1. The kind of door If you're installing a cat flap into the uPVC door panel or double glazing glass seal