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A wall-to-wall cat flap is a great way to allow your pets to move around as they please. You must be careful not to put it too high in the wall. This could result in energy loss and also the possibility of burglars gaining access to your home. A gap in a cavity can also be a problem for future owners if you plan to sell your home. Glass cat doors are a much safer option. Easy to install A wall-to-wall cat flap lets your cat to come or go as it pleases. It's simple to set up and there are many models to choose from. Some mod