If you are planning to install a cat flap in your home, it's best to hire an expert tradesperson. DIY projects typically result in poorly fitted pet flaps that can let in draughts or increase energy bills. SheffLOCK can fit the cat flap into all kinds of doors like wood, https://windowwithcatflap07040.blogunok.com/31033512/using-a-cat-flap-in-bifold-doors