Cov kev xaiv thiab cov qauv ntawm cov hnab nqa khoom sab nraum zoov:
Cov hnab ev khoom sab nraum zoov yeej ib txwm yog qhov chaw uas cov neeg nyiam sab nraum zoov nyiam vim lawv cov yam ntxwv tshwj xeeb, cov txheej txheem tsim khoom thiab cov khoom siv xaiv. Raws li ntau hom kev ua si sab nraum zoov sib txawv, cov neeg siv khoom tau muab cov kev xav tau siab dua rau kev ua haujlwm thiab kev ua haujlwm ntawm cov hnab ev khoom ua si sab nraum zoov. Feem ntau ntawm cov hnab ev khoom ua si sab nraum zoov uas twb muaj lawm siv cov txheej txheem kho dej tsis sib xyaw thiab cov txheej txheem sib xyaw ntawm cov ntaub siv, nrog rau kev xaws, kev ua cov txheej txheem lamination sab nraud, thiab lwm yam, los ntawm kev tsim cov channel cua ncig hauv lub cev ntawm lub hnab ev khoom, teeb tsa tus password xauv, cov kab ci ntsa iab, thiab lub tswb ceeb toom. Tsim cov hnab tshos thiab cov ntaub thaiv hnab tshos rau sab saum toj, lub cev, hauv qab thiab cov hnab pw kom txhim kho cov dej tsis nkag, ua pa tau, kev nyab xeeb, kev thauj khoom thiab lwm yam haujlwm ib txwm muaj ntawm lub hnab ev khoom, nrog rau kev kho mob, kev nqa khoom hloov kho tau, thiab qhov chaw sib npaug ntawm lub ntiajteb txawj nqus thiab lwm yam haujlwm tshiab. Tau kawg, nrog rau kev txhim kho ntawm kev tshawb fawb thiab thev naus laus zis, kev nthuav dav ntawm cov neeg siv, thiab kev tshawb nrhiav tob txog cov neeg siv xav tau, cov hnab ev khoom ua si kuj tau tsim cov qauv tsim tshwj xeeb dua.

Cov hnab ev khoom muaj ob pawg: ib qho yog lub hnab ev khoom loj uas muaj qhov ntim ntawm 50-80 litres; lwm qhov yog lub hnab ev khoom me me uas muaj qhov ntim ntawm 20-35 litres, tseem hu ua "lub hnab nqa khoom tawm tsam". Cov hnab nqa khoom loj feem ntau yog siv los thauj cov khoom siv nce toj hauv kev nce toj, thaum cov hnab nqa khoom me me feem ntau yog siv rau kev nce toj siab lossis cov roob siab. Cov hnab ev khoom nce toj tau tsim los daws cov chaw ib puag ncig hnyav. Lawv tau ua zoo nkauj thiab tshwj xeeb. Feem ntau, lub cev yog nyias thiab ntev, thiab sab nraub qaum ntawm lub hnab yog tsim raws li qhov nkhaus ntuj ntawm lub cev tib neeg, yog li lub cev ntawm lub hnab nyob ze rau sab nraub qaum ntawm tus neeg, yog li txo qhov siab ntawm lub xub pwg nyom los ntawm cov hlua khi. Cov hnab no yog cov dej tsis nkag thiab yuav tsis xau txawm tias nag hnyav.