A cat flap is just a hole you can place in your door to allow your cat to come and leave as they please. This design isn't particularly secure and allows burglars access to your home. Think about upgrading to a model that is lockable or automated, with improved security https://catflapinstallationnearme69318.get-blogging.com/31293597/using-a-cat-flap-in-bifold-doors