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Installing a cat-flap in your door is an easy procedure. You'll need to be aware of a few things before beginning. It is possible to install Upvc panels that have a cat door without having to cut holes in your door or wall. They are available from a number of glass suppliers with a hole that is pre-drilled for a pet door. 1. Safety The cat flaps made of upvc can be easily installed and put on different doors. They are energy efficient and weatherproof, and they have a built-in draft excluder which assists in insulat