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The UPVC/PVCU material is eco-friendly that is impervious to UV and fire. It is also extremely insulated which helps reduce heating costs. It's a good choice for homes located in extreme weather zones. Fitting a cat door into an upvc door is relatively simple. Follow the instructions that come with the kit. Benefits UPVC door panels are highly flexible and can be fitted into a variety frames. They are also resistant to fire and UV radiation. This makes them an excellent choice for homes in extreme climate zon