Ngā āhuatanga tāuru me te putanga o te whakakaha korehau. He pūwāhi piko kei ia pihi e rite ana ki ngā nekehanga korehau rerekē i roto i te ahua, e kiia ana ko te pūwāhi āwhina mana mōrahi, arā, ko te pūwāhi e eke ai te rerekētanga pēhanga e pā ana ki te diaphragm servo ki tōna mōrahi i te pikinga o te kaha tāuru. Mai i tēnei pūwāhi, ko te pikinga o te kaha putanga he rite ki te pikinga o te kaha tāuru.
E ai ki te QC/T307-1999 "Ngā Tikanga Hangarau mō te Whakakaha Korehau", ko te taumata korehau o te pūtake korehau i te wā whakamātautau he 66.7±1.3kPa (500±10mmHg). Ka whakatauhia tuatahitia ngā āhuatanga whakauru me ngā āhuatanga putanga o te whakakaha korehau mā te tikanga tatau. E ai ki te mātāpono mahi o te whakakaha korehau, e rua ngā tawhā āhuatanga ka taea te whakatau tata i runga i te pihi āhuatanga: te kaha whakauru e rite ana ki te pūwāhi mana mōrahi me te tapeke; te ōwehenga o te kaha putanga ki te kaha whakauru i mua i te pūwāhi mana mōrahi, arā, te ōwehenga mana.
