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This review is from: SILVERSTONE AP121 120mm Case cooler
Pros: Excellent flow focus. Very quiet. Very good build quality. Includes speed control cable.
Cons: Flow-focusing vanes restrict fan output. Combined with a restrictive intake, there is very little airflow at full speed. Doesn't spin fast enough to compensate.
Other Thoughts: Used briefly in an NZXT H440. Outside the case or with the front panels and filters off these fans pushed air in a very nice column that made it all the way through the case with little loss in power.
However, once you add an air filter, this cuts down on the air velocity noticeably. It's still pretty good at this point.
Add in the closed-off front panel you typically find in silent cases and this fan becomes anemic and is unable to deliver satisfactory airflow.
The problem is that the focus-flow vanes are restrictions themselves. Add in restrictions from the front or even more restriction at the back (heatsinks and radiators) and this fan is unable to deliver good airflow.
I recommend using this fan as a case fan only. And in a case with little airflow restriction (ie, Silverstone's Fortress or Raven cases, CM HAF cases, etc). You will notice that fans that do have focus-flow vanes (Noctua NF-F12, some Delta fans) have fewer of them to reduce restriction. The Deltas in particular are really good because they spin fast enough that they power through restrictions.