Ƙirƙirar wani nau'i mai mahimmanci na wannan jumla A wasu masu shayarwa, ƙuƙwalwa guda ɗaya suna jagorantar gas ta hanyar'' madauki '.
Tabbas, wani nau'i mai rikitarwa na jumla shine "A cikin wasu rebreathers, bawul din hanya daya yana jagorantar gas ta hanyar'' madauki ', yayin da a wasu gas din da aka hura da kuma fitarwa yana komawa baya da gaba tare da bututu daya: wannan ana kiransa tsarin pendulum. "