https://scientific-programs.sc....ience/wiki/Cat_Flap_
Installing a cat flap on your home is a easy process. You'll need to be aware of a few issues before beginning. upvc door panels with the cat flap can be installed without needing to cut an opening in your wall or door. Many glass companies offer them with holes already made to fit the purpose of a pet-door. 1. Safety The cat flaps made of upvc can be easily installed and put on different doors. They are energy efficient and weatherproof, and have an air-tight seal built-in to aid in insulating the opening. The