https://articlescad.com/back-d....oor-with-cat-flap-fi
https://duke-mcleod.federatedj....ournals.com/replacem
https://notes.io/w5mtC
It is possible to insert the cat flap onto the upvc panel, or even a double glazing sealed unit. However, the most effective alternative is to install a new glass pane with an already-made hole. Read the instructions that should be included with your cat flap kit, and follow them with care. Make sure the illustration accurately depicts the shape (circle or square). Safety If you have a dog or