Izinqwaba zamashubhu zisetshenziswa ezinhlotsheni ezihlukene zokushintshisana kokushisa, njengegobolondo nezishintshi zokushisa zamashubhu kanye nezishintshisi zokushisa ezipholile emoyeni. Kokubili inqwaba yeshubhu eqondile kanye ne-U bend epholise umoya , engashintshwa ngaphandle kokuguqulwa kwamandla okushintshanisa ukushisa futhi avumelane ngokugcwele nezimo zamapayipi nesakhiwo esikhona.