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uPVC door panels are a long-term solution to composite doors. They are strong, durable and resistant to fire. They are also inexpensive and easy to maintain. The most convenient way to insert a cat flap into a uPVC panel is to buy an extra double-glazed sealed unit that has a pre-made hole for the cat flap. is much more secure than cutting a hole in a glass panel. UPVC Doors are easy to maintain Unlike traditional wooden doors, uPVC doors don't require frequent painting or sanding. They are also energy efficient and reduce your