Cov qhov rooj hlau hluav taws tau muab faib ua peb hom, lub sijhawm hluav taws kub ntawm chav kawm A steel hluav taws qhov rooj tsis pub tsawg dua 1.5 teev, lub sijhawm hluav taws kub ntawm chav kawm B steel qhov rooj hluav taws yuav tsum tsis pub tsawg dua 1.0 teev, lub sijhawm hluav taws kub ntawm chav kawm. C steel qhov rooj hluav taws yuav tsum tsis pub tsawg tshaj 0.5 teev.

kev ruaj ntseg qhov rooj x 96,hluav taws kub ntsuas qhov rooj kick phaj,Kev ruaj ntseg qhov rooj 2330, qhov rooj ruaj ntseg 1200,

hluav taws kub resistant qhov rooj manufacturers,kev ruaj ntseg qhov rooj x 96,ob chav steel ruaj ntseg qhov rooj nrog kho vajtse, duab ntawm ntoo kev ruaj ntseg qhov rooj rau flats,kev ruaj ntseg qhov rooj 2330, kev ruaj ntseg qhov rooj qhov ntev, kev ruaj ntseg qhov rooj yees duab,kev ruaj ntseg qhov rooj 1200,hluav taws kub ntsuas qhov rooj 90 feeb, labeled vaj huam sib luag qhov rooj,

ntoo fireproof qhov rooj,kev ruaj ntseg qhov rooj x 96,siv qhov rooj thaum muaj xwm ceev, hluav taws kub ntsuas qhov rooj ul, hluav taws kub ntsuas qhov rooj nyob