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Installing a cat flap your door is a relatively simple process. But, you'll 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 wall or door. Many glass suppliers provide them with holes already cut to fit the purpose of a pet-door. 1. Safety The cat flaps made from upvc are easy to install and put on different doors. They are energy efficient and weatherp