https://zenwriting.net/mallets....ink8/cat-flaps-for-f
https://castillo-mccaffrey.hub....stack.net/how-much-d
https://notes.io/w5Y7s
It is possible to install an animal flap into a door panel made of upvc, or a double glazing glass sealed units, although the best option is to have a new glass pane with an already-made hole. Follow the instructions provided with the kit. Make sure that the sketch accurately depicts the shape (circle or square). Safety If you have a cat or dog and want to allow them access to the garden without having the door