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Installing a cat-flap to your door is a simple process. You'll need to be aware of a few issues prior to getting started. You can put up upvc panels with a cat door without cutting a hole into your wall or door. They are available from a number of glass companies with a pre-made hole for the door for your pet. 1. Safety The cat flaps made from upvc are easy to install and put on different doors. They are weatherproof and energy efficient and have a built-in draft excluder which assists in insulating the opening. They are also f