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Installing a cat flap in your door is a relatively simple task. However, you will need to know a few things prior to beginning. It is possible to install upvc panels with a cat door without cutting the wall or door. They are available from a number of glass suppliers with a pre-made hole to fit a pet door. 1. made of upvc are simple to put in and can be installed to many different types of doors. They are energy efficient and weatherproof, and have a draft excluder built in to help insulate the opening. They are also resi