| 摘要 |
<p>An air filter (10) has a metal box (11) and a corrugated paper filter element (12) in the metal box. Additional air is drawn in through gaps in the corrugated filter element. A base forms a rectangular frame with an inner enlarged part, where there is a lower metal grating. Made from foam produced out of oxygen-enriched ceramic powders, a ceramic filter element forms a rigid barrier filter.</p> |
