https://scientific-programs.sc....ience/wiki/Cat_Flap_
It is recommended to hire an expert to install a cat flap in your home. DIY projects usually result in poorly-fitted pet flaps that allow in drafts and cause more energy costs. SheffLOCK can be fitted as a cat flap in most types of doors including wood composite, uPVC and glass doors, as well as external walls. It takes around 2 hours to install the new cat flap. Pet flaps cost money A pet flap is an ideal option to let your cat leave and come at will. If the flap is not correctly fitted, it could let heat escape from yo