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。