https://humphrey-qvist-2.blogb....right.net/cat-flap-f
It is possible to put the cat flap inside a door panel made of upvc, or a double glazing glass sealed unit, although the best option is to buy a new glass pane with an already-made hole. Follow the instructions provided with the kit. Make sure that the drawing accurately represents the shape (circle or square). Safety A microchip-activated pet panel inside your upvc door is a great solution for those who have a dog or cat and would like to let them out in the garden, but don't want to open the door. It will allow only