| 摘要 |
A tubular member is provided with means, such as vanes, to swirl air passing therethrough to centrifugally separate particles from the air. The tubular member and means are injection molded from plastic, preferably polypropylene, having aluminum or equivalent fibers well dispersed therein to dissipate through the walls of the tubular member the static charge being formed by the impact of randomly charged airborne particles on the inner wall surface thereof.
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