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Installing a cat-flap in your door is a simple process. But, you'll have to be aware of a few things prior to beginning. upvc door panels with the cat flap can be fitted without having to cut holes in your door or wall. Many glass manufacturers offer them with a hole already cut to fit a pet-door. 1. Safety The upvc cat flaps can be easily installed and installed to different doors. They are energy efficient and weatherproof and come with an integrated draft excluder that assists in insulating the opening. They are also fire