https://selfless.wiki/wiki/Cat...._Flap_Installation_i
https://pattern-wiki.win/wiki/....Cat_Flap_Installatio
The addition of a cat flap to your door panel is an important task that should be carried out by an expert. These doors are typically constructed of a thin plastic exterior, which is then bonded to an insulate, soft polystyrene core. It isn't easy to cut through these materials. It's a lot easier to put a cat flap in the glass pane that is already in place or have a brand new door constructed with the hole already prepared. A glazier can do this for you