Eyona njongo iphambili yabalandeli bobungqina bokudubula ayikuthinteli ukuqhuma kwefeni ngokwayo, kodwa endaweni yoko ukuthintela ukugqabhuka kothuli kwindawo yemveliso. Kumashishini athile, iinkqubo zivelisa uthuli olunokutsha noluqhushumbayo, ezifana nentsimbi okanye uthuli lwamalahle. Ukuthintela ezi ntlobo zothuli ukuba zibe moya ngexesha lemveliso, Iinkqubo zokukhupha umoya zidla ngokusetyenziselwa ukufunxa nokuqokelela.
Ngexesha lale nkqubo, ukungqubana okanye iintlantsi kwifeni kunokuba yingozi kakhulu. Kungoko, imfuneko yeefeni ezikhusela uqhushumbo, eziyilwe ngokukodwa kwaye zenziwe kwizinto ezahlukeneyo kwiifeni eziqhelekileyo.
1. Abalandeli bobungqina bokudubula ba zixhotyiswe nge-aluminiyam impellers, ikakhulu ukuthintela iintlantsi eziveliswa yingxabano phakathi kwe-impeller kunye ne-fan casing.
2. Aba balandeli kufuneka babe iqhutywa ziimotor-proof-proof ukuqinisekisa ukusebenza ngokukhuselekileyo kwiindawo ezinokuba yingozi.