https://cameradb.review/wiki/Window_With_Cat_Flap
It is possible to install the cat flap inside a door panel made of upvc, or a double glazing glass sealed unit but the best solution is to buy a new glass pane that has a premade hole installed. Follow the directions that should be included with the kit for cat flaps, and follow them with care. Ensure that the shape drawn (be it square or circle) is accurately represented on the template. Safety If you have a cat or dog and would like to let them in the garden without opening the door A microchip activated pet flap in your upvc door pan