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Installing flap your door is a relatively simple process. However, you will have to be aware of a few things before getting started. Upvc door panels that have an opening for cats can be installed without needing to cut an opening in your door or wall. Many glass manufacturers offer them with a hole that is already designed for an animal-friendly door. 1. Safety Upvc door panels cat flaps are simple to install and can be adapted to different types of doors. They are weatherproof and energy efficient,