Raws li cov qauv tsim qauv, lub qhov rooj hluav taws ntawm lub elevator yuav tsum tau muab tso rau hauv pem hauv ntej nrog, thiab lub qhov rais yuav tsum qhib tib lub sijhawm kom tso pa tawm thiab ua tau raws li qhov xav tau ntawm kev tua hluav taws.

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6 vaj huam sib luag hluav taws qhov rooj,hluav taws kub qhov rooj, hluav taws kub qhov rooj, qhov rooj hluav taws,steel hluav taws qhov rooj,hluav taws kub ntsuas qhov rooj qhov rooj,hluav taws kub txheeb xyuas vaj huam sib luag,hluav taws kub nyob qhov rooj,6 vaj huam sib luag hluav taws qhov rooj,steel hluav taws qhov rooj,fd30 qhov rooj, fireproof qhov rooj,hluav taws kub txheeb xyuas vaj huam sib luag,hluav taws kub resistant qhov rooj,6 vaj huam sib luag hluav taws qhov rooj,90 feeb hluav taws ntsuas qhov rooj,hluav taws kub txheeb xyuas vaj huam sib luag,20 feeb hluav taws ntsuas qhov rooj,steel hluav taws qhov rooj,hluav taws qhov rooj nqi, liding qhov rooj hluav taws