Cov chav ua haujlwm yuav tsum nyob rau hauv qhov chaw ntsiag to, huv si nrog kev nkag tau yooj yim rau cov chaw ua haujlwm. Hauv tsev kho mob feem ntau muaj cov tsev qis- nce siab, lawv yuav tsum nyob rau ntawm sab tis; hauv tsev kho mob feem ntau suav nrog cov tsev siab - nce siab, lawv yuav tsum nyob hauv nruab nrab ntawm lub tsev loj. Lub hauv paus ntsiab lus rau qhov chaw ua haujlwm ntawm chav ua haujlwm thiab lwm lub tuam tsev yog nyob ze rau cov chaw phais mob, cov tsev txhab nyiaj hauv ntshav, cov chaw kuaj duab, chav kuaj kuaj mob, chav kuaj kab mob, thiab lwm yam, kom yooj yim sib txuas lus, thiab deb ntawm chav boiler, kho chav, dej phwj tuaj thiab cov chaw kho mob pov tseg kom tsis txhob muaj kuab paug thiab txo cov suab nrov.
Cov chav ua haujlwm yuav tsum zam kom tsis txhob muaj tshav ntuj ncaj qha ntau li ntau tau, zoo tagnrho rau sab qaum teb. Tinted iav kuj siv tau los thaiv lub hnub ci thiab pab txhawb kev teeb pom kev zoo. Kev taw qhia ntawm chav ua haujlwm yuav tsum zam cov ntawv sau los txo cov plua plav sab hauv tsev thiab cov pa phem. Lawv feem ntau yog teem rau hauv nruab nrab, tsim ib qho chaw kho mob uas muaj kev ywj pheej, nrog rau kev phais thiab cov khoom siv.