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Installing a cat-flap to your door is an easy process. You will need to be aware of a few issues prior to getting started. 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 number of glass suppliers with a hole that is pre-drilled to fit a pet door. 1. Safety The upvc cat flaps 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 he