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uPVC panels are a strong and long-lasting substitute for composite doors. They are strong, durable and resistant to fire. In addition, they are inexpensive and easy to maintain. The easiest way to fit a cat flap into a uPVC panel is to buy an extra double-glazed sealed unit with a pre-cut hole for the flap. This is more secure than cutting a hole in an existing glass panel. UPVC doors are easy to maintain Unlike traditional wooden doors, uPVC doors don't require frequent painting or sanding. They are also ener