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A cat flap that is through the wall is a great way to allow your pets to come and go whenever they like. However, must be careful not to install it too high in the wall. This could result in energy loss and the possibility of burglars entering your home. A hole in a cavity could be a problem for future owners should you decide to sell your home. Glass cat doors are a safer choice. Easy to install A cat flap that is built into the wall allows your cat to come or go whenever it wants. There are many models and they are easy t