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Fan orientation?

post #1 of 9
Thread Starter 
I have a triple 120mm radiator that I am going to mount to the top of my case on the inside, and I need to know where to put the 3x120mm fans. Note: The fans are made of plastic and I doubt they could hold up the radiator for an extended amount of time...

Thoughts?
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post #2 of 9
Almost all the fans are made of hardened plastic. Also it will be your case and the screws you are using that will be carrying the weight. You will be fine dont worry.

It depends on the setup but for me it is like (top to bottom)

Case
Fan (push cold air from outside to inside)
Shroud
Radiator
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post #3 of 9
Thread Starter 
Mhm ok thanks. Also, my shroud is built onto the frame of the radiator, but it's only about 3/4" high off the radiator surface. Is this enough distance, or do I need to mod it?
Edited by zebra_ - 2/7/11 at 3:14pm
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post #4 of 9
As stated, fans are tough enough to hold the rad.

Normally you want them in push for high speed fans, pull for low speed, and either for medium speed.

Exhaust vs intake is always going to be a compromise. Intake means cooler air going through the rad, so cooler water, however you dump the heat into your case. Exhaust means warmer air going through the rad, so warmer water, but you dump the heat outside the case. Up to you really.

3/4" is good enough for a shroud. The optimum depth is ~1" (25mm), so I wouldn't bother modding it.

More details can be found in Martin's test on fan orientation and shrouds. Well worth a read.
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post #5 of 9
I was about to leave something, but when I saw GingerJohn's name there, I knew it would've been unnecessary!

+rep to you, John!
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post #6 of 9
I have my rad mounted to the case and then have my fan shrouds then fans in a pull config.
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post #7 of 9
Thread Starter 
Right so my fans are 1500rpm/120mm/25mm, so according to the "Martin's test" site, I should mount them in a pull (taking air from the outside into the case) configuration. So Case, fan, shroud, radiator, with the fans pulling air from the outside in. Does this seem right to you guys? Also, what about flushing the radiator?
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post #8 of 9
Pull is relative to the radiator. So the fan would be pushing out of the case.

And, yes, flush the radiator with hot water and vinegar.
post #9 of 9
Intake / exhaust is independent of push / pull (sort of). At 1500 RPM it will not make much difference if you run push or pull, set them up however works best for you.



If you imagine that the case is at the top of the picture, the ones on the left are mounted in exhaust, the ones on the right as intake.


Flushing the radiator is advisable as there is usually some flux left over from the soldering process. Some radiators are a lot worse than others. The easiest way to flush a radiator is:

1. Fill the rad with a mix of 9 parts hot water and 1 part vinegar (very rough amounts)

2. Put some stoppers in the ports, pick it up with a towel (it will get warm) and shake.

3. Empty the liquid into a bowl and see if there is any crud in there.

4. If there is anything in the liquid, repeat steps 1 - 3

5. Rinse with distilled water a few times to get rid of vinegar. If you do not have a lot of distilled water then you can rinse with tap water first, then do one rinse with distilled at the end. You will not get any deposits from rinsing with tap water.
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