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The UPVC/PVCU material is eco-friendly that is impervious to UV and fire. It also has a high insulation which reduces heating costs. It's a good choice for homes located in extreme weather zones. Fitting a cat flap into the door made of upvc is easy. Just follow the instructions that should be included with the kit you purchase. are flexible and can be installed in a variety of frames. They are also immune to fire and UV radiation. They are therefore a great choice for homes located in areas that have extreme weather con