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A cat flap that is through the wall is a great method to allow your pets to come and go as they please. However, you should be careful not to install it too high on the wall. This could result in energy loss and burglars to gain entry into your home. Also, if you are planning to sell your house in the future and you have an opening in a cavity wall could be an issue for prospective buyers. Glass cat doors offer a safer alternative. Easy to install A wall-to-wall cat