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Sorry but i got another questionarchilochus said:The higher CFM fans have a thicker frame to get the fan hub further back from the HS.This is supposed to help eliminate the dead spot in front of the hub.NO air! The lower CFM fan bodies (frame) ARE 25mm.The fans are about the same the Delta costing more.The Delta uses 1.5amps@4800 RPM-110 CFM@55dBA
Vantec Tornado uses 1.0amps@4800 RPM-119 CFM@56dBA
Both have the 38mm frame.Also helps with the noise some what.
Hope this info helps. Yes the tornado uses less Amps and gets more CFM.@the same RPM as the Delta