https://stairways.wiki/wiki/Through_Wall_Cat_Flap
https://algowiki.win/wiki/Post....:Upvc_Door_Panels_Wi
Professional cat flap installers can install your pet's door into either a door, or a wall. The wall-mounted version is more secure because an intruder won't be able to get through. It also helps prevent draughts and reduces your energy costs. The Tasker will mark where the cat flap is in your door, then cut the corners. They will also sand the edges of the frame to give it a smooth surface. Microchip A microchip cat door is an easy and effective method to keep pets in