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Installing a cat-flap on your door is an easy procedure. But, you'll have to be aware of a few things prior to starting. upvc door panels with a cat flap can be installed without having to cut an opening in your wall or door. They are available from a number of glass companies with a pre-made hole to fit a pet door. 1. Safety The cat flaps made from upvc can be easily installed and fitted to a variety of different doors. They are weatherproof and energy efficient and come with an air-tight seal built-in to hel