A basic cat flap is basically a hole that you can put in your door to let your cat leave and come as they please. This design isn't particularly secure and gives burglars access to your home. You may also want to think about upgrading to an automated or lockable https://cat-flap-installer-near-m85987.dreamyblogs.com/31051828/adding-a-cat-flap-to-your-bifold-doors