After looking at a couple of other motorized impellers from other manuf's, what you are looking at is inches of water. The Ps that is on their PDF is for 'pressure static'.
You need to clear up the .25A current draw. If it was a custom fan for someone it might be a slow, quiet blower. Taking the specs for their current 4021 and lowering the curve for only .25A would give you a fan that gives about 25 cfm @ .3 inches of water. Not exactly what I think you were looking for.
Hope this helps.
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