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Installing a cat flap in your door is a relatively simple process. But, you'll have to be aware of a few things before getting started. You can install upvc panels with the cat door without cutting a hole into your wall or door. Many glass suppliers provide them with holes that is already designed to fit an animal-friendly door. 1. Safety The cat flaps made from upvc can be easily erected and installed to different doors. They are weatherproof and energy efficient and come with an air-tight seal built-in to help in