Zomwe zimagwirira ntchito ndi magawo ang'anjo ya tunnel:
Kutalika kwa ng'anjo: 160 mamita
Chiwerengero cha ma crucible pa kiln galimoto iliyonse: 6x4x4=96
Malo ogwirira ntchito: Zimatenga maola 24 kuti mumve kutentha kwa chipinda kufika pa 1150 digiri Celsius nthawi yotchinjiriza: 1150 digiri X72 hrs. Zimatenga maola 24. Kuziziritsa kuchokera ku 1150 digiri mpaka 400 digiri The pamwamba 120hrs.
Amatengedwa ngati kuzungulira, zomwe zikutanthauza kuti zimatenga maola 120. Kuti galimoto yoyaka moto ilowe ndikutuluka mung'anjo, ndipo imatchedwa ntchito imodzi pafupifupi 60 pachaka, crucible ikukonzekera kugwiritsidwa ntchito nthawi 300.
mpweya mkati mwa ng'anjo. Mpweya umapanga 5% pomwe ena onse amakhala mpweya wa carbon monoxide ndi kuchepetsa mpweya
