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Installing a cat-flap to your door is an easy process. You'll need to be aware of a few issues prior to getting started. Upvc door panels that have an opening for cats can be installed without needing to cut holes in your door or wall. They are available from a range of glass manufacturers with a premade hole for a pet door. 1. Safety Upvc door panels cat flaps are easy to install and can be installed to many different types of doors. They are weatherproof and energy efficient and feature draft-proofing bui