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uPVC door panels provide a long-term solution to composite doors. They are durable, effective and fireproof. In addition, they are cost-effective and easy to maintain. The purchase of a double-glazed, sealed unit that has an opening already cut for the cat flap is the simplest method of installing the cat flap on a uPVC sheet. This is safer 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.