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Installing a cat-flap in your home is a simple procedure. However, you will need to know a few things prior to beginning. upvc door panels with an opening for cats can be installed without needing to cut holes in your wall or door. They are available from a number of glass companies with a premade hole to fit a pet door. 1. Safety The cat flaps made from upvc can be easily erected and installed to different doors. They are weatherproof and energy efficient and come with a draft excluder built-in that assist