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A cat flap that runs through the wall allows your pet to go in and out whenever they like. But, you should be careful not to place it too high on the wall. This could result in energy loss and burglars to gain entry into your home. A hole in a cavity could be a problem for future owners if you plan to sell your home. Glass cat doors offer a safer alternative. Easy to install A cat flap that is built into the wall is a great way to let your cat leave and come back as it pleases. There are a variety of models available and they are simple to install. S