Ib lub qhov rooj hluav taws yuav tsum tau dai ntawm steelbearing-hom hinges. Kev siv ntawm cov hlau yog tsim nyog cov hlau uas tsis muaj hlau ua "elastic" ntawm ntau qis dua qhov kub, uas ua rau muaj hluav taws kub. Muaj ntau cov pob khawm tsim ntawm cov hlau tsis-ferrous uas tej zaum siv rau ntawm cov pob khawm hluav taws.
Cov kabmob hom knuckles ntawm hinges yog tas yuav muab cov haujlwm du kom txo tau cov kev coj mus. Nco ntsoov, lub qhov rooj hluav taws yuav tsum tau nqus tau thaum muaj hluav taws. Hnav cov hinges rho tawm lub qhov rooj rau sag, muaj kev tiv thaiv zoo lub qhov rooj ntawm kev kaw. Kev Zam: Somemanuffactures yuav muab cov qhov rooj nrog kev hingeswhich yog hom tsis yog hom thaum lawv sau cov npe ua ke.
NFPA 8 {{{{}} tso cai rau kev siv lub cev hnyav (1.34 nti nplooj tuab)}}}}}}}}}}}}}} Nplooj tuab) {4-1 / 2 "hinges. Qee cov tuam ntxhab muaj cov hauv kev muab lub cev yuag sib zog ua ke ntawm lub zog tshaj 8 'hauv qhov siab yog ib feem ntawm cov npe ntawm cov npe teev tseg. (Kev txiav txim siab yuav tsum tau muab cov khawm hluav taws xob tolleri ntau thiab tsawg rau cov neeg siv khoom hnyav lossis nquag.)
