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Installing a cat-flap in your door is a simple procedure. You will need to be aware of a few issues before you begin. Upvc door panels with an opening for cats can be installed without having to cut a hole in your door or wall. Many glass companies offer them with a hole already cut for the purpose of a pet-door. 1. Safety Upvc door panels cat flaps are easy to install and can be adapted to different types of doors. They are weatherproof and energy efficient, and they have a built-in draft excluder which helps to seal the ope