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A cat flap that is built into the wall allows your pets to come in and out whenever they like. Be sure to not install it too high in the wall. This could lead to energy loss and the possibility of burglars entering your home. A hole in a cavity could be a problem for future owners if you intend to sell your home. Cat doors made of glass are an alternative that is safer. Easy to install A cat flap that is built into the wall allows your cat to come or go whenever it wants. There are a variety of models