It is best to hire an professional to install a cat-flap in your home. DIY projects typically result in a poorly-fitted pet flap, which can let in drafts and result in more energy costs. SheffLOCK can be installed as a cat flap on all kinds of doors like wood composite, https://cat-flap-install89299.blogdanica.com/30723779/using-a-cat-flap-in-bifold-doors