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A cat flap that runs through the wall allows your pets to come out and in as they please. However, you should be cautious not to put it too high on the wall. This can lead to energy loss and the possibility of burglars entering your home. Also, if you are planning to sell your house in the near future and you have an opening in a cavity wall could be an issue for the new owners. Glass cat doors are a safer choice. Easy to install A cat flap that is built into the wall is a great method to allow your cat to come and go at will.