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Installing a cat-flap on your door is a simple process. However, you will have to be aware of a few things prior to beginning. It is possible to install upvc panels with a cat door without having to cut the wall or door. They are available from a number of glass suppliers with a pre-made hole for the door for your pet. 1. Safety upvc door panels cat flaps are simple to put in and can be installed to many different kinds of doors. They are weatherproof and energy efficient and have an integrated draft excluder that assists in insulating the opening.