It is recommended to hire an expert to install a cat flap at your home. DIY projects typically result in poorly fitting pet flaps that allow in draughts or raise the cost of energy. SheffLOCK can be installed as the cat flap into all kinds of doors, including wood composite, https://window-cat-flap58763.tribunablog.com/how-much-does-a-cat-flap-cost-45097855