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Professional cat flap installers will install your pet's door into either a door, or a wall. The latter is more secure as the burglar cannot reach through it. It also lowers energy costs and prevents draughts. The Tasker will mark where the cat flap should be in your door, then drill out the corners. They will also sand the edges of the frame to give it a smooth surface. Microchip cat flaps A microchip cat door is an easy and effective way to keep pets inside your home. It reads the unique microchip ID