Double glazing can be fitted with flaps for dogs and cats to allow your pets to leave and come whenever they want. They also help keep your pet safe while you're away. You can put in a cat flap in an existing uPVC or double glazing sealed unit. However, you https://cat-flap-fitting51637.iyublog.com/30220122/installing-a-cat-flap-in-a-upvc-door-cost