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A cat flap that is built into the wall allows your pets to come out and in whenever they want. However, you must be cautious not to put it too high in the wall. This could lead to energy loss and the risk of burglars entering your home. Also, if you are planning to sell your house in the future, having a hole in a cavity wall could be an issue for the new owners. Glass cat doors are a safer option. Easy to install A cat flap that is built into the wall allows your cat to come or go when it wants. There are many