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Installing a cat flap in your door is a relatively simple task. However, you will require some things prior to beginning. upvc door panels with a cat flap can be installed without having to cut a hole in your wall or door. They are available from a variety of glass companies with a pre-made hole to fit a pet door. 1. Safety Cat flaps made of upvc are easy to install and can be fitted to many different types of doors. They are weatherproof and energy efficient and come with an integrated draft excluder that assists in insulating the opening. T