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It's easier than you think to put an animal flap inside a solid uPVC panel or sealed double-glazed unit. If you don't have the appropriate tools or experience you will require the assistance of a professional. Follow this guide to learn how to measure and mark the area in the uPVC panel to make your cat flap. Additionally, learn how to make it weather and draft resistant. Safety A upvc-clad panel with a cat flap is a great s