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Installing a cat flap on your home is a easy process. You will need to be aware of a few points before you begin. Upvc door panels with an opening for cats can be installed without having to cut holes in your door or wall. They are available from a variety of glass suppliers with a premade hole to fit the door for your pet. 1. Safety Upvc door panels cat flaps are easy to install and can be fitted to many different types of doors. They are weatherproof and energy efficient, and have a draft excluder built in to