Lub qhov rooj hluav taws yog ua los ntawm cov khoom siv tiag tiag los tiv thaiv koj txoj kev nyab xeeb. High-density fire door core board + tag nrho cov khoom tuab = qhov rooj zoo. Peb yog ib qho chaw tsim hluav taws xob qhov rooj rau kev tsim thiab tsim khoom.

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