Ko nga ahuatanga whakauru me te whakaputanga o te whakakaha korehau.He tohu korikori kei runga i ia pihi e rite ana ki nga nekehanga korehau rereke i roto i te ahua, e kiia ana ko te tohu awhina kaha morahi, ara, ko te waahi ka eke te rereketanga o te pehanga i runga i te diaphragm servo ki tona morahi ina piki te kaha whakauru.Mai i tenei wa, ko te pikinga o te kaha whakaputa ka rite ki te pikinga o te kaha whakauru.
E ai ki a QC/T307-1999 "Nga Tikanga Hangarau mo te Booster korehau", ko te tohu korehau o te puna korehau i te wa o te whakamatautau he 66.7±1.3kPa (500±10mmHg).Ko nga ahuatanga whakauru me te whakaputanga o te whakakorikori korehau kua whakatauhia e te tikanga tatauranga.E ai ki te maataapono mahi o te whakakorikori korehau, e rua nga tawhā ahuatanga i runga i te kurupae ahuatanga ka taea te tata: ko te kaha whakauru e rite ana ki te tohu hiko teitei me te tapeke;Ko te ōwehenga o te kaha whakaputa ki te kaha whakauru i mua i te tohu mana teitei, ara te ōwehenga mana
