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A cat flap that runs through the wall allows your pet to go out and in whenever they want. Be careful not to install it too high in the wall. This can lead to energy loss and the possibility of burglars gaining access to your home. A cavity with a hole can also be a problem for future owners if you plan to sell your house. Glass cat doors are a safer choice. Easy to install A wall-to-wall cat flap is a great method to allow your cat to leave and come back at will. There are numerous models available and they are easy to put up.