https://telegra.ph/How-to-Inst....all-a-UPVC-Door-Pane
https://output.jsbin.com/recevafone/
Double glazing can be fitted with flaps for dogs and cats to allow your pets to leave and come as they please. They also help keep your pet safe while you're away. You can put in the cat flap inside an existing uPVC or double glazing sealed unit. However, you'll require a new part with an opening that is pre-made. A glazier can do this with the right equipment and the right training. Easy to install Having a cat flap in your home is a great way to allow your pet free access