https://blogfreely.net/colonyj....eans8/fitting-a-cat-
It is possible to insert a cat flap into an upvc panel or double glazing sealed unit. However, the best alternative is to install a new glass pane with an already-made hole. Follow the directions that should be included with the kit for cat flaps, and follow them with care. Make sure the sketch accurately depicts the shape (circle or square). Safety A microchip activated pet door in your upvc door is a fantastic option for those who have a dog or cat and want to let them out into the garden, but do not want to open t