Lub qhov rooj steel fireproof yog tsim los ntawm lub qhov rooj ncej, lub qhov rooj nplooj ncej thiab lub qhov rooj nplooj vaj huam sib luag ua los ntawm cov ntaub ntawv steel. Sab hauv ntawm lub qhov rooj nplooj yog sau nrog ib puag ncig-phooj ywg hluav taws kub retardant thiab thermal rwb thaiv tsev cov ntaub ntawv, thiab yog nruab nrog fireproof hardware fittings.

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