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Installing a cat-flap to your door is an easy process. However, you'll have to be aware of a few things prior to starting. upvc door panels with a cat flap can be installed without having to cut holes in your door or wall. Many glass suppliers offer them with a hole already made for a pet-door. 1. Safety Upvc door panels cat flaps are easy to install and can be installed to many different kinds of doors. They are energy efficient and weatherproof and have an integrated