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Installing a cat flap on your home is a simple task. You'll need to be aware of a few points before you begin. Upvc door panels with the cat flap can be fitted without having to cut holes in your door or wall. They are available from a number of glass manufacturers with a pre-made hole to fit 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 have a draft excluder built-in that assists in insulating the opening. They are