Owing to reasonable duct distribution, PH3 can distributed uniformly and the PH3 concentration reached quickly effective standard. The difficult problem on fumigation in large warehouse was solved.

由于内环流管网风道布置合理，熏蒸气体在高大粮堆中均匀分布，各部位PH3浓度快速达到有效浓度，解决了高大平房仓的熏蒸难题。

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Duct branch is rich in natural form of uniform distribution, wall smooth, branch pipe and tube diameter on the transition to a flat.

导管分支丰富，形态自然，分布均匀，管壁光滑，分支导管与上一级导管管径过渡平缓。

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Hence, for improving the uniformityof air supply and the performance of the duct, it is of great importance to studythe rules of resistance distribution in static pressure air supply duct.

研究静压送风道的阻力分布规律，对提高送风均匀性和改善送风道性能有重要意义。

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