Iimfama zi-flaxes ngaphandle kweziko eliqhutywa (umngxunya okanye ukuvula) kwaye ziyafumaneka kubuso obuphakamileyo (i-RF) kunye ne-FFAR. Ngelixa uninzi lweentlobo zefleki zenza inqaku lonxibelelwano ezivumela ukuhamba kolwelo, igesi, okanye umoya, iiflethi ezingaboniyo zisetyenziselwa ukuphela kwenkqubo yokuphelisa kunye nokuthintela ukuhamba. Iiflevu ezingaboniyo zinokusetyenziswa xa kuvavanywa uxinzelelo lombhobho, ukwenza indawo yokufikelela kwinkqubo yokufaka, ukutywina okwethutyana inkqubo yokufakelwa okanye ukulungisa umgca, okanye ukwenza itywina lexesha elide ukuphelisa inkqubo yokulinganisa.