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High CFM-Low DBA

M

mrmagoo_83

2[H]4U
Joined
Aug 8, 2002
Messages
3,068
I am looking for a brand of good High CFM-Low DBA fans. I need three fans a 120mm, and 2 80mms. I want them to move air fairly well. This is for a secret project I am working on.

I was hoping to get the same brand but I guess it doesn't have to be. And I would like them as cheap as possible, $20/fan is out of the question.


Also, what would be considered a tolerable noise level these days? I was thinking under 30dB, but is that considered loud these days?
 
Ahhhh, I know just the fans you need, and cheap too !
But I can not.t tell you - it's a secret.

Define High Define Low

Or since you dont have any design goals/spec other than some nebulus spec terminology you have picked up, (as high CFM and low noise are mutually exclusive design goals) buy some big bad fans and put them on an inexpense speed controller like a fan mate 2 so you can adjust the balance between airflow and noise.
 
wwparrish said:
Or since you dont have any design goals/spec other than some nebulus spec terminology you have picked up, (as high CFM and low noise are mutually exclusive design goals) buy some big bad fans and put them on an inexpense speed controller like a fan mate 2 so you can adjust the balance between airflow and noise.
Click to expand...


Agreed. You cannot possibly meet all of the limits you just defined. "High" CFM fans generall make a lot of noise. And the ones that are quieter are expensive. Either get/make a fanbus, or you're going to have to make some comprimises...
 
I realize that, I know high cfm=high noise, I was hoping for a little common sense, and respect, and a balance between the two.

Tornados are way off the list, too damn loud, 50+db is a big no. Thats why I asked what the standard of tolerable noise levels was these days. I believe anything under 30dB is tolerable.

Now to simplify the question....I am in search of a good sub 30dB fan with high CFM. So whats the highest CFM fan I can get rated at under 30dB.


And a fan controller may play in later, but not sure how well that will work right now.
 
Well I am an old cranky engineer, not a social worker.

In my professional opinion its a damn lie. If those specs were anywhere near true they whould not have to advertise those fans Every computer company and enthusiast would be camped at the factory doors.

Do not look at sales spece. go to evercools website or panaflow or Pabst or San Ace and look at the engineering specs. And then beleive only 1/2 of what you see as the testing methods vary greatly, so much so thats its almost impossible to compare.

there are 2689 posts here on "what fan should I buy" search on "fan noise".

I like the meduim speed panaflows but thats me .

http://www.nexfan.com/papa12hywaco.html

engineering data found on Panasonic web site, industrial/appliance division
 
I got a silenx 120mm fan last night and it's very silent. Only 40 cfm tho and expensive compared to most fans. Says it's 11dba which while not really that low imho, it's very hard to hear sitting right next to the case as i am...
 
You might want to check out silentpcreview.com

http://www.silentpcreview.com/article25-page1.html

This page have a file with many fans on it with actual cfm/db listed. it also tells you what is the cfm and db rating at 7v and 5v with 1 or 2 fans. worth check it out, imo. The file is a pdf or excel file. Truly excellent site if you looking for silent pc related informations. They actually test the fans with mic at 1M away from pc.


Nexus 120mm fan is good, around 40cfm and 20db or so, even running at 12v is really quiet. If you looking something with higher cfm, i would recommend the YateLoon medium speed DC12SM series, they are good for around 70cfm but still pretty quiet. at 12v you will head the air noise but not bearing noise. at 7v, it is silent.

Visit the forums in Silentpcreview will show you that they do not like SilentX fans there. so you can do some research on what is best for you. Good luck
 
A look at evercools web site confirms my suspicions.

what is "max airflow " ? I bet $10 as soon as you put the filter on it to create a little backpressure the airflow is 50CFM or less. There is no P/Q curve (speed vs CFM vs Airflow) so one can determine (ar at least take a guess) what the fan will do installed in equipment.

No explanation of how the noise figure was measured. Any fan will do 25dba if you move the measuring microphone far enough away.

Additionaly that is a 1 inch thick (25mm) fan making me even more dubious of the CFM rating. usually you have to go to 36mm thick fans to get 80 CFM at a low noise level.
 
Volume perception is all relative anyway, so even if the testing methods for dBA were the same accross the board from all manufacturers it still means very little.

If you want a kick-ass 120mm buy one of mine! :D

I have some 151cfm deltas that are definately loud at full speed (53dba) but are not bad at all when running at 5v.

http://www.hardforum.com/showthread.php?t=930632
 
Well, it all depends on how you parse the thread title...

The Tornado & Delta posts have been perfect suggestions, assuming you take the string "High CFM-Low dBa" and parse it out as "High CFM" - "Low dBa".

Run the literals through an English parser ([H]ardOCP reader) and then you've got 70+ CFM at 50+ dB. It's perfect I tell you!
 
Rule of thumb for quiet system. (not silent but quiet to endure for majority of people)

1) 120mm fan shall never go over 1800 RPM.
2) 80mm fan shall never go over 2000 RPM.

These should reduce your number of selection greatly and make it easier to search based on.

YateLoon fan is excellent for 120mm and 80mm Panaflo L1a will do very nicely. Now if there is any restriction (say radiator, etc) on that 120mm, I would go with 120mmx38mm (thicker than those 25mm) fan so that restriction doesn't overtly lower your fan's performance.
I am assuming 2 80mm inlet and 1x120mm exhaust in which case above mentioned will do nice balance of neutral pressure setup case where cooling per noise will be most optimized.
 
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