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UPVC/PVCU, a material resistant to UV rays and fire, is eco-friendly. It is also highly insulated which can reduce heating costs. It's a great option for homes in areas with extreme weather conditions. Installing a cat flap on the door made of upvc is easy. Follow the directions that should be included with the kit you buy. are flexible and can be installed in a variety of frames. They also resist UV radiation and fire. This makes them a good option for homes in harsh temperatur