Txhua lub qhov rooj hluav taws kub tau ntsuas raws li lawv cov hluav taws tsis taus. Qhov no yog lub npe hu ua FD ntsuam xyuas thiab raug ntsuas raws ntau yam kev sib txawv. FD 30 thiab FD 60 yog cov pawg tseem ceeb ntawm lub qhov rooj hluav taws. FD 30 txhais tau tias lub qhov rooj hluav taws muaj qhov tsawg kawg 30 feeb ntawm hluav taws tsis kam. Lub qhov rooj nrog kev ntaus nqi ntawm FD60s muaj tsawg kawg 60 feeb ntawm hluav taws tsis kam thiab yog lub qhov rooj ntsuas pa taws. Nws yog feem ntau tau txais uas muab cov txheej txheem uas xav tau ntawm kev tiv thaiv hluav taws, txhua qhov rooj tua hluav taws yuav tsum txhawb nqa nrog cov ntsaws ruaj ruaj lossis sib xyaw ua ke.
Raws li cov qauv Askiv 476 Hluav Taws Kub Kev Nyab Xeeb Kev Nyab Xeeb, feem ntau cov qhov rooj yuav tsum yog S-hom (pa luam yeeb) qhov rooj. Muaj lub qhov rooj tua hluav taws tau nruab nrog cov hlab ntsha intumescent tuaj yeem pab lub qhov rooj tsim nyog rau cov txheej txheem no. Cov ntsaws ruaj ruaj yuav tsum tau txwv tsis pub dhau los ntawm tus nqi ntawm 3 sau cov chaw pa luam yeeb los ntawm 1 meter ntawm qhov rooj ntug ib teev. Yog tias koj xav tau kev qhia meej ntxiv rau ntawm lub qhov rooj hluav taws xob yuav tsum tau, peb tau qhia koj txog cov chaw tsim hluav taws xob ua thiab qauv.
Yog hais tias lub qhov rooj tsis tau raws li cov kev tswj hwm lub qhov rooj ntawm lub qhov rooj hluav taws, ntxiv cov hlua sib xyaw ib leeg yuav tsis txhais tau tias nws yuav muab txoj kev tiv thaiv tib yam li hluav taws. Thaum tsis muaj dab tsi nres koj los ntawm kev txhim kho interbescent ib daim hlab ntawm lub qhov rooj tsis tu ncua, lub qhov rooj tseem yuav poob luv luv ntawm kev tswj hwm.
