Iifeni ze-axial ezinobungqina bokudubula ziyilelwe ukuhanjiswa komoya, ngelixa iifeni ze-centrifugal ezinobungqina bokudubula zisetyenziselwa iinjongo zokukhupha. Aba balandeli baxhotyiswe ngokusebenza kobungqina bokudubula, ukubenza balungele ukusetyenziswa kumashishini akhethekileyo afuna amanyathelo angqongqo okhuseleko. Ukusebenza ngokufanelekileyo nangokukhuselekileyo kwezi ndawo ziyingozi, kufuneka zidityaniswe neenjini ezingagqabhukiyo.
Olu qwalaselo loyilo luqinisekisa ukuba abalandeli banokubamba umoya onokutsha ngaphandle kokubeka umngcipheko wokutsha.. Ngokulungiselela iimfuno ezithile zamashishini, aba balandeli babonelela ngezisombululo ezithembekileyo nezikhuselekileyo zokuhamba komoya, kubalulekile ukugcina zombini ukusebenza ngokufanelekileyo kunye nemigangatho yokhuseleko kwiindawo nge qhuma iigesi okanye uthuli.