| 摘要 |
<p>The chimney top cover for improving draught has circumferential openings for flow, connected with the chimney channel. Side openings (3) are arranged at normal to the axis of the chimney stack channel. On the outside surface of the circumferential wall are arranged below each opening (3) concave or trough shaped baffles (7). The openings ensure entry of air for entraining flue gases and the closed top prevents entry of rain and snow.</p> |
