To do this the air must circulate freely inside each compartment and along the whole length of the supply system; consequently, stopping or slowing down a fan which is apparently supplying too much air to one compartment may have the effect of entirely depriving other compartments of their fresh air .
Ukuze oku kwenzeke umoya kufanele ujikeleze ngokukhululekileyo ngaphakathi kwindawo nganye yokuhlala kwaye kufutshne nobude bayo yonke inkqubo yokwenza oku; isiphumo, kuba kukumiswa okanye ukucothiswa kwephiko elikhangeleka ngathi linikezela ngomoya kakhulu kwindawo enye yokuhlala onokuthi ube nempembelelo yokuthintela ezinye indawo zokuhlala ekubeni zifumane umoya omtsha.