https://opensourcebridge.scien....ce/wiki/Cat_Flap_Ins
Professionals should be responsible for the installation of a cat flap onto your door panel. The doors usually have the plastic exterior, which is thin and flimsy, and then joined to a soft, insulating polystyrene core. These materials are often difficult to cut. It is much simpler to put the cat flap into an existing glass pane, or to have the hole drilled for a new door. A glazier will be capable of doing this for you. Easy to install If you have a cat and would like to let them in and ou