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A cat flap that runs through the wall lets your pets come in and out whenever they want. However, you should be careful not to install it too high in the wall. This can cause the loss of energy and also allow burglars to break into your home. A hole in a cavity can also be a problem for future owners if you intend to sell your house. Glass cat doors are a much safer choice. Easy to install A cat flap that is built into the wall