| 摘要 |
A casing to be secured to a cooking oven comprises an upper plate 6 and a lower plate 7 and has an inlet opening 8 for fumes and air to pass through a passage 3 and escape through an outlet opening 9. The fumes and air pass through passages 4 in a ceramic block 1 held by supports 5. The passages 4 have linings of catalysts such as salts of platinum or other precious metals, and an electrical heating resistance 2 raises the temperature of the fumes and air and the block 1. <IMAGE> |
