https://opensourcebridge.scien....ce/wiki/UPVC_Door_Pa
A door made of upvc with a cat flaps can help lessen the draughts inside your home. By keeping your pets warm and out of cold air, you can reduce heating costs. Although it is possible to install a cat flap in double glazing as well as upvc sealed units, it is more difficult than with timber doors. This is because upvc is available in a variety of thicknesses. Benefits A cat flap that is attached to your door is a fantastic way of keeping your pet in or out of the home while still allowing people in. It also keeps out