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Professional cat flap installers can 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 helps prevent the spread of draughts and also reduces your energy costs. The Tasker will mark the position of the cat flap in your door, and then drill the corners. They will also sand the edges of the frame to give it a smooth surface. Microchip cat flaps A microchip