Steel fireproof qhov rooj yog lub qhov rooj uas muaj tej yam hluav taws kub, uas yog tsim los ntawm fireproof hardware fittings. Lub qhov rooj hluav taws xob steel muaj lub sijhawm ntev ntev los tiv thaiv kev sib kis ntawm hluav taws, txiav tawm qhov hluav taws kub thiab siv zog rau lub sijhawm tua hluav taws.

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