He pai te hoffman kiln mo nga wheketere pereki me te kaha o ia ra mo te 50,000-200,000 pereki.
(Mena he tiketike rawa to kaha, ka tūtohu matouthe Umunga Tunnel mo koe.)
Ko nga tawhā taketake o Hoffman kiln:
| Te maha o te tatau | He wahanga o te ahi | whanui roto（m） | Roto teitei(m) | Te kaha o ia ra(pcs) |
| 18-24 | 1 | 3.6-3.9 | 2.6-2.8 | ≥70,000 |
| 18-24 | 1 | 3.9-4.2 | 2.6-2.8 | ≥80,000 |
| 32-48 | 2 | 3.6-3.9 | 2.6-2.8 | ≥130,000 |
| 32-48 | 2 | 3.9-4.2 | 2.6-2.8 | ≥150,000 |
| 48-72 | 3 | 3.6-3.9 | 2.6-2.8 | ≥190,000 |
| 48-72 | 3 | 3.9-4.2 | 2.6-2.8 | ≥210,000 |
| ≥72 | ≥4 | 3.6-3.9 | 2.6-2.8 | ≥250,000 |
Wā tuku: Akuhata-23-2021