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I think that vertical blinds are best for plastic windows. Contact Van BC blinds Sonata Design at https://sonatadesign.ca/vancouver-blinds/ to pick them up or even make them to order. Vertical blinds are similar to ordinary blinds. They protect the room from the sun's rays worse, but have many other features. Such blinds can be installed on windows of any shape. They also visually enlarge the room and lengthen the ceilings.