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  #11    
Old 04-22-2009, 03:33 PM
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Quote:
Originally Posted by v12xjs View Post
Hey Fuckat7t.
Personally I've tried 12v fans from Zalman, Noctua and many others. I've also tried 240v 80mm fans from Pabst and I wasn't happy with any of them, so I understand why you started the thread.
There's some great info on silent fans here:
http://www.silentpcreview.com/article63-page1.html
and here:
http://www.silentpcreview.com/section12.html

I'm sure I could be proved wrong but in my experience, silence comes at the price of airflow. If you need more CFM then you will get more noise. The mains powered fans from Pabst are the quietest available and cost a small fortune but at 32db they are almost deafening in a quiet room so I wouldn't advise them for anybody. Shame really as they can blow the balls off a charging elephant at 30 paces!
The biggest danger is that in trying to get the quietest fans and running them at 12v for max cooling, there is nowhere to go when the outside temps get higher.
My preference these days is to get well known and high output fans that aren't especially quiet and hook them up to a variable power supply.
All fans are quiet if run at 6 volts and in winter this will do fine. As temps start to get higher I turn up the voltage to 7.5 or 9 volts to get better cooling whilst still not running them at full tilt.
The Zalman and Thermaltake seem to last plenty long enough and blow as hard as any. That's what I run these days.
Just remember it's easier to quieten a powerful fan than it is to get more air out of a silent one.

Very good advice, I appreciate the input. All very true points, and they can be key to keeping your buds healthy!

For my own situation I feel I may have spoken too soon. I went back today to have a look and I noticed that the temps in my box dropped from 84 to 77, which is just fine by me (I thought this might have been due to the ambient temp being diffrent, but checking my thermo on my window it claims that the inside temps have remained at 70 all day). I think the reason it took so long to cool things down was because I was running the box without a fan all night to see what it would climb to, (about 90) I'm sure the soil and the box itself held onto alot of that heat, and it just took a while to dissapate.

and thanks for the post florida! I appreciate your experience as well.

cheers.
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Last edited by fuckat7t; 04-22-2009 at 03:37 PM..
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  #12    
Old 04-22-2009, 04:27 PM
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Make: Scythe
Model: Ultra Kaze
Purchased From: NCIX.com
Price: $15.11 plus shipping
Bearing Type: Sleave
Sound level: 32.9 dBA
Powered By: 12 V Adapter
CFM: 87.6
Pros: Very silent. I switched from an 80 mm fan that sounded like a turbine to this one. You can barely hear it in a completely silent room. The CFM's are also very high and it keeps my rubbermaid grow nice and cool
Cons: None to date
Other Comments: When looking for a PC fan, silence is usally an issue to consider. The problem with going for silence is you lose out on CFM. I found that by going with a higher blade size, ie 120mm, the fan has to make less revolutions to push the same amount of air as an 80 mm fan: hence less noise.

Overall Rating: 5 - Excellent CFM coupled with a low dBA.

I would like to note that for fans showing a dBa of anything less than 20, you should really check up on their claims. When using a sound booth to test, the background noise is usally around 20 dBa. Therefore there is no way to even measure a dBa rating of 14 etc.



http://ncix.com/products/index.php?s...facture=Scythe

Check out this page for info on sound level testing:

http://www.nexustek.nl/NXS-nexus92mm...entcasefan.htm
Last edited by yeldarb; 04-22-2009 at 04:29 PM..
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  #13    
Old 04-22-2009, 04:59 PM
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Very good, I am excited people are actually posting their info!

as yeldarb mentioned, if you have the space, up the size of the fan. Bigger blades means more air movement at lower RPM's which ultimately means less noise. Check the link from v12 for more info on the technicalities of the science of bigger blades, very interesting!

I love the info guys, we are getting some great stuff. Hopefully this can be the one stop shop for PC fan info!

Cheers.
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Last edited by fuckat7t; 04-22-2009 at 05:01 PM..
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  #14    
Old 04-22-2009, 07:19 PM
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Originally Posted by arcticvapors View Post
not to jack the thread - but to floridasucks - that's one inventive grow box...very nice!

thanks..

if anyone wants to see it in action check the link in my sig.
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  #15    
Old 04-23-2009, 03:57 PM
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Hi guys im just new to the forums but have been reserching the pc grow box, space is limited and the pc idea really apeals. I have bought my seeds lowrider 2's http://www.cannabis-seeds-bank.co.uk...der-3081-p.asp. i have now to get a pc case thinking about a gaming tower to get a wee bit more space and they seem to have vents and fans built in, hope they will be enough. any tips you guys can give will be grand.

v12xjs i have pretty much read everything you have posted and my god it is alot, same with you floridasucks.

hope you dont think i have hijaked the thread fuck@7t.
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  #16    
Old 04-23-2009, 08:52 PM
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Quote:
Originally Posted by blakcat View Post
Hi guys im just new to the forums but have been reserching the pc grow box, space is limited and the pc idea really apeals. I have bought my seeds lowrider 2's http://www.cannabis-seeds-bank.co.uk...der-3081-p.asp. i have now to get a pc case thinking about a gaming tower to get a wee bit more space and they seem to have vents and fans built in, hope they will be enough. any tips you guys can give will be grand.

v12xjs i have pretty much read everything you have posted and my god it is alot, same with you floridasucks.

hope you dont think i have hijaked the thread fuck@7t.

welcome to RIU. good luck.
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  #17    
Old 06-06-2009, 04:57 PM
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Very cool setup. Looks good. One question: Now how do you power these things again? You said you used a Radio Shark 12v converter.. how to you actually connect it though? Can you provide a photo or explanation?
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  #18    
Old 07-05-2009, 05:27 AM
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Right, im pretty sure what i use ARE computer fans, but they're about 3 or 4 times as big, but still same design.

Make: Thermaltake
Model: TT 12025A-1B1S
Purchased From: No idea, i got about 5 of em for free from a mate.
Price: About £5
Size: 120x120x25
Bearing Type: Sleeve
Sound level: 34dB
Powered By: 12V DC [direct]
CFM: 78.0 CFM
RPM: 2000rpm + 10%
Pros: Great fan does everything you need
Cons: Runs a little loud but it's nothing more than a ballast sound [get digital ballasts!!!!!]
Other Comments: It's better than a computer fan, but it's still not as good as a real exhaust fan.
Overall Rating: 6 /10
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  #19    
Old 07-05-2009, 11:25 AM
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Make: Thermaltake
Model: A2029
Purchased From: www.newegg.com
Price: $11.99
Size: 120mm
Bearing Type: 2 Ball (I know, I know!)
Sound level: 25 - 45dBA (Variable Speed Fan)
Powered By: Some old AC - DC power plug i had layin around
CFM: 35 - 95CFM
RPM: 1300 - 3500 RPM
Pros: Can use any DC power pack you have layin' around because of variable speed.
Cons: A lil' on the noisy side when cranked all the way up.
Other Comments:
Overall Rating: let's say 7
Link: www.newegg.com

This thing can move a lot of air! My little space is 8 cubic feet. This means at full speed this little fan is completely exhausting the air inside 12 times per minute! I am just using passive intake at the moment, but the intake port feels like a little vacuum if you put your hand next to it!
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  #20    
Old 07-08-2009, 09:34 AM
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HAHA what about fans from my old 360?
 
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