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Installing a cat-flap on your door is a simple procedure. It is important to be aware of a few points prior to getting started. Upvc door panels with a cat flap can be installed without having to cut holes in your wall or door. Many glass manufacturers offer them with holes that is already designed to fit the purpose of a pet-door. 1. Safety upvc door panels cat flaps are simple to put in and can be installed to many different types of doors. They are energy efficient and weatherproof and come with a