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uPVC panels are a durable and long-lasting alternative to composite doors. They are durable, effective and resistant to fire. They are also cost-effective and easy to maintain. The most straightforward way to install an animal flap on a uPVC panel is to order an extra double-glazed sealed unit with a pre-cut hole for the cat flap. This is much safer than cutting the hole in a glass panel. UPVC Doors are easy to maintain Unlike traditional wooden doors, uPVC doors don't require frequent painting or sanding.