Double glazing can be equipped with dog and cat flaps to let your pet go and go whenever they want. They also help keep your pet safe while you're away. You can install a cat flap into an existing uPVC or double glazing sealed unit. However, you will require a https://cat-flap-in-upvc-door-pan85418.ltfblog.com/30020128/installing-a-cat-flap-in-a-upvc-door-cost