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Installing a cat flap on solid uPVC door panels or double-glazed sealed units is a lot easier than it sounds. If you don't have the appropriate equipment or know-how, you'll require the assistance of professionals. This guide will show you how to mark the, measure and cut the cat flap area on the uPVC panel. Also, how to make it draft and weather resistant. Safety A upvc-clad panel with an enclosed flap for cats is a great way to keep your pet secure while allowing the pet to move about freely. These