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Installing a cat flap in your door is a relatively simple task. However, you will need to know a few things prior to beginning. You can put up Upvc panels that have the cat door without cutting holes in your door or wall. Many glass manufacturers offer them with a hole already made to fit an animal-friendly door. 1. Safety Upvc door panels cat flaps are easy to install and can be adapted to different types of doors. They are energy efficient and weatherproof, and have a draft excluder built in to aid in insulating the opening