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uPVC panels are a strong and long-lasting substitute for composite doors. They are durable, energy efficient, and are resistant to fire. They are also reasonably priced and easy-to-maintain. The most straightforward way to install the cat flap onto a uPVC panel is to buy an extra double-glazed sealed unit with a pre-cut hole for the flap. This is a lot safer than trying to cut holes in a glass panel. UPVC Doors are easy to maintain Unlike traditional wooden doors, u