Ukubala ubungakanani bomoya odlula kwinkqubo yomoya ongena ngaphakathi
F - Ubume becandelo be-duct. Uluxande okanye ujikeleze.
D - Ububanzi be-duct.
X - Ububanzi be-duct engxande.
Y - Ukuphakama kwe-duct engxande.
E - Isantya somoya, umzuzwana.
Iimpawu.
Ukubala ubungakanani bomoya odlula kwi-duct ye-ventilation.