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An interesting idea for a fan grille that would improve performance

post #1 of 8
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Looking at the back of the Silverstone Air Penetrator fans, it seems like they get most of their "air channeling" effect from the grille at the back of the fan:




So my question is, why hasn't anyone designed a fan grille with the exact same shape? Then, you could simply attach the grille to the back of any standard fan and get the same effect.

A video showing the air channeling effect of these fans:

http://youtu.be/8m8fC809TK0?t=1m43s
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post #2 of 8
Could I ask you something? Which 120mm/140mm Fans includes Fan filter?
post #3 of 8
996gt2: I have 2 of those fans. The 140mm one makes a lot of noise at full speed, and the 120mm one doesn't move air (just 35cfm). They are very restrictive.

But... Silverstone does make an after-market grill with the same purpose: the FF-121. It's a dust filter and air channel in one. Note that it must be mounted on the exhaust side of the fan, not in the intake.

There's also the Nexus Beamair. I have it, but I didn't get any improvement. However, the fan I used is a slip stream 120 1200rpm which is probably the least ideal fan to try it on.
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post #4 of 8
Other companies make grills like this, but they are deeper and use fewer vanes. An example is here. Another here. Like this:



The reason they use fewer vanes is to reduce resistance. The zillions of vanes Silverstone uses are narrow to minimize air resistance, but there is a reason Silverstone uses such broad fan blades: they really need the static pressure to overcome the resistance those vanes make.
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post #5 of 8
The swirl is a somewhat old design actually, and if done right it seems to work pretty well. It doesn't restrict airflow all that much, nor does it increase noise levels as much as some other fan grills, including the honeycomb. The swirl on the Silverstone fan does look at bit tight though.

Effects of Grill Patterns on Fan Performance/Noise

Quote:
Taking both noise and airflow into account, here is our final list of grill designs in order of best to worse:

1. Wire
2. Swirl
3. Loose Swirl
4. Stamped Circles
5. Honeycomb
6. Mesh
7. Concentric Circles
8. Angled Slats
9. Turbine

Edited by Celoth - 10/29/11 at 5:15pm
post #6 of 8
+rep for the link
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post #7 of 8
This grill, the "BeamAir", is supposed to make any 120mm fan act similar to an "air penetrator" fan. The picture at the bottom of the page seems to yield similar results to what you see with air penetrator fans.

http://www.nexustek.nl/NXS-nexus-beamair-airguider.htm
    
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post #8 of 8
I have BeamAir. It does focus the air stream, but it makes noise and reduces the output.
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