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Installing a cat-flap on your door is an easy process. It is important to be aware of a few things before you begin. You can install upvc panels with a cat door without having to cut holes in your door or wall. They are available from a number of glass companies with a pre-made hole for a pet door. 1. Safety Cat flaps made of upvc are easy to install and can be fitted to many different kinds of doors. They are weatherproof and energy efficient and come with an integrated draft