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Installing a cat flap on your home is a easy process. But, you'll need to know a few things before getting started. upvc door panels with a cat flap can be installed without having to cut an opening in your door or wall. Many glass suppliers provide them with holes already made for a pet-door. 1. Safety The upvc cat flaps are easy to install and fitted to a variety of different doors. They are energy efficient and weatherproof and come with a draft excluder built in to aid in insulating the opening. They are a