https://informatic.wiki/wiki/C....at_Flap_Installation
Installing a cat flap on your door's panel is an essential task that should be completed by an experienced professional. These doors are usually made of a thin plastic exterior, which is then bonded to an insulate, soft polystyrene core. It can be difficult to cut through these materials. It's a lot easier to put the cat flap inside the glass pane that is already in place, or have a new door made with the hole already made. A Glazier can do this for you. Easy to install Upvc door panels can be a great option if you have a