https://elearnportal.science/w....iki/Using_uPVC_Cat_F
uPVC panels are a strong and long-lasting substitute for composite doors. They are strong energy efficient, durable, and are resistant to fire. They are also affordable and easy-to-maintain. A double-glazed sealed unit that has already cut a hole for the cat flap is the most convenient method to install an animal flap inside a uPVC sheet. This is a lot safer than cutting the hole in an existing glass panel. UPVC Doors are easy to maintain Unlike traditional wooden doors, uPVC doors don't require frequent painting or sand