https://telegra.ph/How-to-Choo....se-a-Cat-Flap-Instal
https://gentry-mclamb-2.federa....tedjournals.com/cat-
It is possible to install the cat flap onto an upvc panel or double glazing sealed unit. However, the best solution is to put in a new glass pane with an already-made hole. Read the instructions that should be provided with the kit for cat flaps, and follow them closely. Make sure the shape you've drawn (be it circle or square) is accurately represented on the template. Safety If you have a cat or dog and want to let them into the garden witho