https://scientific-programs.sc....ience/wiki/UPVC_Door
Double glazing can be fitted with dog and cat flaps that allow your pet to go and go whenever they want. They also help keep your pet's attention when you are away. It is possible to put a cat flap inside an existing uPVC panel or double glazing glass sealed unit, but you'll need to replace the piece that has a hole already made. This can be done by a glazier who has the appropriate equipment and experience. Easy to install A cat flap is a great option to allow your pet to have access to the outdoors without