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A cat flap is an excellent way for your pet to enter and exit the house. Professional cat flap installers can set up the flap to maximize your pet's freedom while maintaining the strength and stability of the windows and doors. Use a spirit level to determine the precise location for the flap. The best location for the flap is generally around 4.7 inches from the floor to your cat's belly height. Versatility When it is about cat flaps, there are a variety of cat flaps to pick from. Each flap comes with its own set of unique features.