alyuminiy simlar bilan, sovuqka chidamli polivinilxlorid plastik izolyatsiyasi bilan, ajratish qatlamiga ega (ichki qoplama), past yonuvchanlikka ega sovuqka chidamli polivinilxlorid plastikdan himoya shlangi bilan, ekranlangan, po'lat galvanizlangan lentalar bilan mustahkamlangan
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