Qhov sib txawv ntawm lub qhov rooj thiab lub thav duab yog qhov tseem ceeb heev thiab yuav tsum tsim nyog rau lub intumescent sau haum.
Nyob rau hauv dav dav qhov sib txawv yuav tsum tsis pub tshaj 3mm raws li 2 hli raws li 2 ntev thiab thoob plaws sab saum toj ntawm lub qhov rooj.
Txhawm rau pab tshawb xyuas ntawm qhov sib txawv ntawm qhov chaw, tus qauv BWF-ntawv pov thawj Gaptester Is muaj pub dawb ntawm kev thov.
Qhov sib txawv hauv qab ntawm lub qhov rooj feem ntau yog nyob ib puag ncig 10 hli * rau cov tsis muaj pa hluav taws xob tab sis 3 hli thaum yuav tsum muaj pa luam yeeb.
