https://pattern-wiki.win/wiki/....Cat_Flap_Fitting_Nea
https://morphomics.science/wik....i/Installing_a_Cat_F
Installing a pet flap on your French or patio doors is a great idea if you own pets such as a cat or dog. It lets them get in and out without having to open the door. There are several cat flaps available designed to fit into uPVC or composite doors, as well as wooden doors. Some come with a four-way locking system which can be set to exit only or in-only. Installation Cat flaps are a great method to let your cat in and out of your home without opening