If you are planning to install a cat flap inside your home, it's best to hire a professional tradesperson. DIY projects usually result in a poorly-fitted pet flap that allow in drafts and cause more energy costs. SheffLOCK can fit a cat flap in most types of doors including wood, https://cat-flap-installers75631.bleepblogs.com/31304656/using-a-cat-flap-in-bifold-doors