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Antec 920 fan

post #1 of 5
Thread Starter 
I just installed the 920 kuhler with the arrows pointing out of the case (exhaust), so the antec stickers face the rear of the case.

problem is, when i hold a flame to the exhaust grill from the outside, the flamer moves towards the grillas if the setup is sucking air.

If i wanted the set up to be exhaust, should the antec stickers face in towards the case?
post #2 of 5
I think you have set it up correctly.

The Antec sticker should be facing out. A fan sucks air in from the side that the blades are seen without the 4 supports.
See pics 1 and 2 below.

I suppose you can even feel the wind pressure with your bare hands.
Or, just put a piece of toilet paper over the exhaust on the outside of the case. If the toilet paper falls off, it is exhausting and you have proper setup. If the toilet paper stays on, then you have it reversed. Just a few seconds will do.
post #3 of 5
Thread Starter 
thats weird, the toilet paper shows that its blowing, but the flame shows it sucking hmmmm Anybody want to give the flame test a try?
post #4 of 5
Quote:
Originally Posted by mnkeyprince;13746419 
thats weird, the toilet paper shows that its blowing, but the flame shows it sucking hmmmm Anybody want to give the flame test a try?

Basic fluid dynamics: a negative vortex region is formed immediately in the central region of the exhausting side.

A daily life analogy: when wind blows over a wall, a similar zone is formed behind the wall. See pic 1 for a simplified diagram. Note the 3 red circled arrows. They basically move backward toward the wall.

A fan behaves similarly. See pic 2. If a flame is put in this region, the flame tends to be drawn toward the fan. See pic 3 for a CFD analysis of a typical computer fan. Note the negative vortex region to the right of the fan, ie the big blue arrow.

I hope this helps.
post #5 of 5
Thread Starter 
i knew it had to do with negative wind vortex regions!

lol thanks man tongue.gif
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