https://jsfiddle.net/pologear2/7d0Lnurz/
Installing a cat-flap on your door is a simple procedure. It is important to be aware of a few points before you begin. It is possible to install upvc panels with the cat door without cutting a hole into your wall or door. are available from a variety of glass companies with a premade hole to fit a pet door. 1. Safety The upvc cat flaps can be easily installed and fitted to a variety of different doors. They are energy efficient and weatherproof and come with a built-in draft excluder which helps to insulate the opening. They are also fire resis