https://www.openlearning.com/u..../dillonhensley-smapy
https://telegra.ph/Window-With-Cat-Flap-11-01-9
Double glazing can be equipped with flaps for dogs and cats to let your pet leave and come at their own pace. These are also great to keep your pet's attention while 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 a replacement piece that has a hole already made. A glazier can do this using the appropriate equipment and knowledge. Easy to install Installing a cat fl