Umgangatho ococekileyo wegumbi

EUnited States, de kwasekupheleni kukaNovemba 2001, kwasetyenziswa umgangatho womanyano 209E (FED-STD-209E) ukuchaza iimfuno zamagumbi acocekileyo. NgoNovemba 29, 2001, le migangatho yatshintshwa ngokupapashwa kwe-ISO Specification 14644-1. Ngokuqhelekileyo, igumbi elicocekileyo elisetyenziselwa ukuvelisa okanye uphando lwezesayensi yindawo elawulwayo kunye namanqanaba aphantsi okungcola, njengothuli, i-microbes emoyeni, i-aerosol particles, kunye nomphunga wamachiza. Ukuchaneka, indawo yokucoca inezinga lokungcola elilawulwayo, elichazwe ngamanani eengqungquthela kwi-cubic meter kwi-particle echaziweyo. Kwindawo eqhelekileyo yasezidolophini, umoya wangaphandle uqulethe i-35 yezigidi ze-particles per cubic meter, i-0.5 microns ububanzi okanye enkulu, ehambelana ne-ISO 9 igumbi elicocekileyo kwinqanaba eliphantsi lomgangatho wegumbi elicocekileyo. Amagumbi acocekileyo ahlelwa ngokococeko lomoya. Kwi-US Federal Standard 209 (A ukuya ku-D), inani lamasuntswana alingana okanye ngaphezulu kwe-0.5mm lilinganiswa kwi-1 cubic foot of air, kwaye olu balo lusetyenziselwa ukwahlula amagumbi acocekileyo. Le metric nomenclature yamkelwe yinguqulelo yamva nje ye-209E yomgangatho. I-China isebenzisa umgangatho we-federal 209E. Umgangatho omtsha yi-International Standards Organisation's TC 209. Yomibini imigangatho ihlela amagumbi acocekileyo ngokusekwe kwinani lamasuntswana emoyeni welabhoratri. Imigangatho yokuhlelwa kwegumbi elicocekileyo i-FS 209E kunye ne-ISO 14644-1 idinga imilinganiselo ethile yokubala imilinganiselo kunye nokubala ukuhlelwa kwenqanaba lokucoceka kwegumbi elicocekileyo okanye indawo ecocekileyo. EUnited Kingdom, iBritish Standard 5295 isetyenziselwa ukwahlula amagumbi acocekileyo. Lo mgangatho kungekudala uza kutshintshwa yi-BS EN ISO 14644-1. Amagumbi acocekileyo ahlelwa ngokwenani kunye nobukhulu bamaqhekeza avunyelwe ngomthamo womoya. Amanani amakhulu afana ne-"Class 100" okanye "Class 1000" abhekiselele kwi-FED_STD209E, emele inani lamasuntswana angama-0.5 mm okanye ubukhulu obuvumelekileyo kwi-cubic foot nganye yomoya.