| 摘要 |
<p>A vertical hollow tube (1) is used for the forced ventilation of ambient air from adjacent ceiling. The air is fed downwards for absorbing the heat produced by a filament lamps. Concentric cylindrical structures (6), being transparent and perforated, form a housing (3). A fan (2) creates forced air circulation in the housing about the lamps (4). The cylindrical structures form circular crowns filled with e.g. insulating glass wool (7). The heated air exits the lower part of the housing.</p> |
