Ob chav qhov rooj hluav taws muaj nyob nrog lossis tsis muaj qhov rais, nyob ntawm qhov chaw siv. Ob chav qhib hluav taws qhov rooj yog ua los ntawm galvanized steel phaj, uas tsis yooj yim rau deformed, thiab yog fireproof thiab ya raws.

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