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Installing a cat-flap in your home is a simple process. But, you'll need to know a few things prior to beginning. You can install Upvc panels to create a cat door without having to cut holes in your door or wall. Many glass companies offer them with a hole already made for a pet-door. 1. Safety Cat flaps made of upvc are simple to put in and can be installed to many different types of doors. They are weatherproof and energy efficient and come with an integrated draft excluder that helps to seal the o