| 摘要 |
Shield structure usable with a particulate matter sampler having a particle size cut-off inlet, comprises: (a) porous shield extending at least part way about said sampler inlet for reducing the velocity of gas flow reaching said inlet via the shield, (b) said shield forming openings that pass the air and particulate entrained in the air for flow at reduced velocity within an open interior zone defined by the shield means and adapted to receive said sampler inlet.
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