https://www.openlearning.com/u..../georgebrown-skrwox/
uPVC doors are a popular choice for homes. They are sturdy and easy to maintain. They can be difficult to fit with an enclosure for cats. Most of the time, a replacement upvc panel with cat flap is the best option. It is simple to install and is much less expensive than a new door. Safety uPVC panels with cat flaps let your pet move into or out of your home without opening the door. The door panels are available in various designs and can be made to fit into any door frame. They are also energy efficient