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uPVC panels are a strong and long-lasting alternative to composite doors. They are strong, energy efficient, and fireproof. Additionally, they are cost-effective and easy to maintain. The purchase of a double-glazed, sealed unit that has a hole already made for the cat flap is the easiest way to install the cat flap on a uPVC sheet. This is a lot safer than cutting holes in a glass panel. UPVC doors are easy to maintain Unlike traditional wooden doors, uPVC doors don't require frequent painting or sanding.