https://opensourcebridge.scien....ce/wiki/Adding_a_Com
https://sciencewiki.science/wi....ki/Fitting_a_Cat_Fla
Professionals should take care of the installation of a cat flap on your door panel. These doors are usually made of a thin plastic exterior, which is then bonded to an insulate, soft polystyrene core. These materials can be difficult to cut. It is a lot easier to install the cat flap inside an existing glass pane or to make the hole in a door. A glazier is in a position to assist you. Easy to install If you have a cat and want to allow them to enter and exit