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A through-wall cat flap lets your pets come in and out whenever they like. You must be careful not to install it too high into the wall. This could lead to energy loss and also the possibility of burglars entering your home. A gap in a cavity can be a challenge for future owners if you intend to sell your home. Glass cat doors are a safer choice. Easy to install A cat flap that is built into the wall is a great way to allow your cat to move around whenever it wants. It is easy to install and there are many models to choose fro