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Installing a cat-flap on your door is an easy procedure. But, you'll require some things prior to starting. upvc door panels with a cat flap can be installed without having to cut a hole in your door or wall. Many glass companies offer them with holes already cut to fit the purpose of a pet-door. 1. Safety The cat flaps made from upvc are easy to install and installed to different doors. They are weatherproof and energy efficient, and have an air-tight seal built-in to help insulate the o