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Installing a cat-flap to your door is an easy process. However, you will have to be aware of a few things before getting started. You can install Upvc panels that have a cat door without cutting holes in your door or wall. Many glass companies offer them with a hole that is already designed for the purpose of a pet-door. 1. Safety Cat flaps made of upvc are simple to install and can be adapted to different types of doors. They are energy efficient and weatherproof and have a draft excluder b