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A cat flap that is built into the wall allows your pet to go out and in as they please. However, you must be cautious not to put it too high in the wall. This can lead to energy loss and the possibility of burglars breaking into your home. If you are planning to sell your home in the future, having an opening in your cavity wall could be an issue for prospective buyers. Glass cat doors are a much safer option. Easy to install A wall-to-wall cat flap is a great option to allow your cat to move around as it pleases. It's simple to set up