https://posteezy.com/using-upv....c-cat-flap-door-pane
https://squareblogs.net/boards....auce98/cat-flap-doub
It is possible to fit an animal flap into the door panel made of upvc or double glazing glass sealed unit however the best choice is to buy a new glass pane with an already-made hole. Follow the directions that should be provided with your cat flap kit, and follow them carefully. Make sure that the shape you have drawn (be it circle or square) is accurately depicted on the template. Safety If you have a cat or dog and would like to let them into the garden without