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A cat flap that is built into the wall lets your pets come in and out whenever they want. Be sure not to install it too high in the wall. This could result in the loss of energy and also allow burglars to break into your home. Also, if you are planning to sell your house in the future and you have a hole in a cavity wall can be an issue for the new owners. Glass cat doors offer a safer alternative. Easy to install A cat flap that is built into the wall is a great way to allow your cat to leave and come back whenever it want