https://scientific-programs.sc....ience/wiki/Back_Door
If you're planning to put in a cat flap in your home, it is recommended to work with a professional tradesperson. DIY projects usually result in poorly fitted pet flaps that allow in draughts and lead to higher energy bills. SheffLOCK can be installed as the cat flap into all types of doors including wood composite, uPVC and glass doors and even external walls. It takes about 2 hours to put up the new cat flap. Pet flaps cost money A pet flap is a great option to let your cat leave and come at will. However, if the