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It's simpler than you think to install a cat flap in the solid uPVC panel or a sealed double-glazed unit. If you don't have the appropriate tools or expertise, you'll require the help of a professional. Follow this guide to learn how to measure, mark and cut the area of the uPVC panel for your cat flap. Additionally, learn how to make the flap weather and draft-proof. Safety A door made of upvc with a cat fla