https://articlescad.com/cat-fl....aps-for-french-doors
A cat flap fitting professional will set up your pet's door inside a door or in the wall. The latter is more secure because burglars are unable to get through it. It also helps prevent draughts and reduces your energy bills. The Tasker will mark where the cat flap should go in your door, and then drill the corners. They will also smooth the edges of the frame to give it a smooth finish. Microchip cat flaps A microchip cat door is an easy and effective way to keep pets inside your home. It reads the unique microchip identifi