https://marvelvsdc.faith/wiki/....Choosing_Cat_Flap_In
Adding a cat flap to your door is an important task that should be carried out by an experienced professional. The doors usually have the plastic exterior, which is thin and flimsy, and then that is bonded to a soft insulating polystyrene core. These materials can be difficult to cut. It is much simpler to install the cat flap into an existing glass pane, or to have the hole drilled in a new door. A glazier is capable of doing this for you. Easy to Fit If you have a cat and want to let them in and out without leaving your home,