Inkomba yokusebenza yesihlungi somoya ibhekisela kakhulu ekusebenzeni kahle kokususa uthuli, ukumelana, kanye namandla okuphatha uthuli. Ukusebenza kahle kokususa uthuli kungabalwa ngokwendlela elandelayo:
Ukusebenza kahle kokususa uthuli=(G2/G1)×100%
G1: Inani elimaphakathi lothuli kusihlungi (g/h)
G2: Inani elimaphakathi lothuli elingahlungwa(g/h)
Ukusebenza kahle kokususa uthuli kuncike kusayizi wezinhlayiya. Ukumelana kusho ingcindezi yokwehluka. Ngesisekelo sokuqinisekisa ubuncane besihlungi, ingcindezi encane yokwehluka izoba ngcono kakhulu. Ukumelana okwandayo kuzogcina kuholele ekusetshenzisweni kwamandla amaningi. Ukumelana okukhulu kakhulu kuzodala ukudlidliza kwe-air compressor. Ngakho-ke, kufanele ufake esikhundleni sesici sesihlungi lapho ukumelana kwesihlungi kufinyelela noma kuseduze nengcindezi ye-vacuum evunyelwe. Ngaphezu kwalokho, umthamo wokubamba uthuli usho isilinganiso sothuli oluqoqiwe endaweni ngayinye. Futhi iyunithi yalo ingu-g/m2.