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Installing a cat-flap on your door is an easy procedure. You'll need to be aware of a few things before you begin. Upvc door panels with a cat flap can be fitted without having to cut an opening in your door or wall. They are available from a variety of glass companies with a premade hole for a pet door. 1. Safety upvc door panels cat flaps are simple to install and can be installed to many different kinds of doors. They are weatherproof and energy efficient and come wit