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Installing a cat flap in your home is a simple task. You will need to be aware of a few issues before beginning. Upvc door panels with an opening for cats can be installed without having to cut an opening in your door or wall. are available from a number of glass companies with a hole that is pre-drilled to fit a pet door. 1. Safety The cat flaps made from upvc can be easily installed and installed to different doors. They are weatherproof and energy efficient