Fan curves for Shop Vacs: 150 cfm & 20 inches H2O

We produce a Laboratory meter stand for agricultural seed planters. We need an air movement system that can handle 20 inches of water at 100-150 cfm. We are looking unsuccessfully in the newsgroups to find fan curves for commercial shop vacs. Is that the best solution for this flow/static combination?
Thanks! Justin Koch
1) Source of supply for Fan curves. 2) Tradeoffs between shop vacs and dust collection systems.
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