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The UPVC/PVCU material, which is resistant to UV rays and fire, is eco-friendly. It is also extremely insulated which helps reduce heating costs. It's a great choice for homes located in areas that have extreme weather conditions. The installation of a cat's door into a upvc is relatively easy. Follow the instructions included with the kit. are flexible and can be placed in a variety of frames. They also resist fire and UV radiation. They are therefore a good option for homes in areas that have extreme weather conditions.