| 摘要 |
This invention relates to a chimney (10) constructed with parts which are separately movable inwardly of the chimney (10), as under wind pressure. The chimney (10) is constructed using a net framwork around a central column (11), the framework carrying cone shaped panels (20) which can open inwardly of the framework to allow ingress of air. The panels (20) can be lowered in high wind conditions. |
