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Installing a cat-flap on your door is an easy process. But, you'll need to know a few things prior to beginning. upvc door panels with the cat flap can be installed without needing to cut an opening in your wall or door. Many glass manufacturers offer them with holes already cut to fit the purpose of a pet-door. 1. Safety The cat flaps made from upvc can be easily installed and put on different doors. They are energy efficient and weatherproof and feature a draft excluder built in to aid in insulating the opening. They are also res