Shoko rokuti nhungu dzechefu yegasi (Gas chambers kuChirungu) riri kushandiswa pano kureva chombo chekuuraya mhuka kana vanhu chinoshandisa chefu yegasi inopomberwa mumba yakavharika kwose zvokuti hapana pokuti gasi ringabude kana kuti munhu angabude. Gasi rinonyanya kushandiswa sechefu rinonzi hydrogen cyanide, asi carbon dioxide uye carbon monoxide dzinomboshandiswawo. nhungu dzechefu yegasi dzaishandiswa senzira yekuuraya vasungwa vainge vatongerwa kufa muUnited States of America mumwaka wechizana 1920. Hurumende yebato reNazi rekuGermany yakashandisa nhungu dzechefu yegasi senzira yokuuraya vanhu vazhinji muzvirongwa zvebaradzarudzi zvakauraya maJudah mamiriyoni matanhatu; chiitiko ichi chinozivikanwa nezita rokuti rutsvamhumburu. Kunonzi nyika yakasununguka yeCroatia yakashandisawo nhungu dzechefu yegasi kukamba yekuuraya yaive kuJasenovac. Nhungu dzechefu yegasi dzakashandiswa zvakanyanya muGermany panguva yeNazi, iyi iri nzira yekuparadza vanhu vakaremara mitezo kana pfungwa neavo vaizvidzwa semhandu panhau dzematongerwo enyika. Izvi zvakaitika mumwaka wechikumi 1930 uye 1940. Mugore 1942 mwedzi waJune vasungwa vane chitsama chemazana vaisanganisira 45 vebato remaCommunist rekuNetherlands vakaurayiwa nechefu yegasi paBernburg. Panguva iyi gasi raisarudzwa pakuita izvi raive carbon monoxide iro raitorwa kubva pamuchovha uri kutinhira.