Fan too good to be true?

[kwjake]

http://www.svc.com/u8025.html

Fan Dimension R80: 80 x 80 x 25 mm
Fan Speed R80: 1,800 ~ 3,800 R.P.M.
Air flow R80: 53.499 CFM
Air pressure R80: 8.658 mm-H2O
Fan Noise R80: 24.4 ~37.9 dBA
Fan Bearing Type Long life sleeve bearing

$1.49


If the cfm and dba is accurate, this seems to be a killer deal.

 

[paadness]

No big surprize actually. Its a good fan but don't compare the prices with other brands which charge much of it for thier name.

 

[JDCentral]

Hehe... I went to a surplus/pawn shop, and they had a big box of computer parts labeled '50 cents'.

There were about 4 fans in the box, looked to be pulled from an older server box. Anyway - I needed some case fans, so I bought em... they're worth every penny just because they work ;-)

And because they're loud as hell and push enough air for me to feel it about 2-3 feet away from the case.

 

[Navid]

Originally posted by: kwjake
37.9 dBA

That's loud.

 

[BillyBobJoel71]

yeah, and if they were too good to be true they would be only a dollar 49.

 

[sodcha0s]

Originally posted by: Navid

Originally posted by: kwjake
37.9 dBA

That's loud.

Not for 3800 RPM.

 

[theMan]

id say thats one hell of a deal.

 

[Navid]

Originally posted by: sodcha0s

Originally posted by: Navid

Originally posted by: kwjake
37.9 dBA

That's loud.

Not for 3800 RPM.

I see! So, this does not make noise (not too loud) because it moves a lot of air. Very interesting logic!

 

[The Sly Syl]

Seemed like a great deal.

Till i found out that i had over $8 shipping for the cheapest available option. >_>

 

[Goi]

Wow that's cheap. It looks new too. Wasn't there when I was buying fans from them a month ago.

 

[sodcha0s]

Originally posted by: Navid

Originally posted by: sodcha0s

Originally posted by: Navid

Originally posted by: kwjake
37.9 dBA

That's loud.

Not for 3800 RPM.

I see! So, this does not make noise (not too loud) because it moves a lot of air. Very interesting logic!

You are a 'tard. You could in fact run it at ~1800RPM and get ~ 24.4dBA which, since you don't seem to be able to figure these things out for yourself, is pretty quiet. For $1.49, find a better deal for us, or shut your pie hole.

 

[Navid]

Originally posted by: sodcha0s

Originally posted by: Navid

Originally posted by: sodcha0s

Originally posted by: Navid

Originally posted by: kwjake
37.9 dBA

That's loud.

Not for 3800 RPM.

I see! So, this does not make noise (not too loud) because it moves a lot of air. Very interesting logic!

You are a 'tard. You could in fact run it at ~1800RPM and get ~ 24.4dBA which, since you don't seem to be able to figure these things out for yourself, is pretty quiet. For $1.49, find a better deal for us, or shut your pie hole.

You must have had public speech training. The quality shines through!

If you drop the RPM of a fan, you reduce the amount of air it moves (CFM).
If you drop the RPM of this fan to 1800 to make it 24dBA, its CFM drops to 24.5.

In comparison, this fan has a 24CFM at only 21dBA. That is half as loud (3dB lower).

Yes, this fan is cheap. For a good reason!

 

[aurellie1]

We need an Thermaltake fan with 340CFM at only 14dB!

 

[Navid]

Originally posted by: aurellie1
We need an Thermaltake fan with 340CFM at only 14dB!

Sign me up for one!

The problem is that the best you can do with the design of a fan is to eliminate the noise of its motor. But, the noise from the air movement remains. After all, a fan is supposed to move air.

You can completely eliminate the noise of the motor by placing the fan in another room and using a pipe to bring the air to the PC. This of course is a ridiculous idea since the resistance of the pipe will dramatically reduce the air flow. But, if you can imagine an ideal imaginary pipe with no resistance! The air that moves out of the pipe and into the PC will go through obstacles like the grid or the components inside the case. This movement of air through obstacles creates noise. You cannot eliminate this kind of noise by changing the fan.

 

[sodcha0s]

If you drop the RPM of a fan, you reduce the amount of air it moves (CFM).

If you drop the RPM of this fan to 1800 to make it 24dBA, its CFM drops to 24.5.

In comparison, this fan has a 24CFM at only 21dBA. That is half as loud (3dB lower).

Yes, that Panaflo fan is very nice. In fact, I have a couple of them in one of my PSU's, and I must say they are almost completely silent. And I would also say that twice as loud as almost silent is, for all intents and purposes, pretty fvcking quiet. And considering the the Panaflo costs over 7 times as much and cannot push more than 24 CFM (@12v), you can't exactly call it a "killer deal."

The problem is that the best you can do with the design of a fan is to eliminate the noise of its motor. But, the noise from the air movement remains. After all, a fan is supposed to move air. You can completely eliminate the noise of the motor by placing the fan in another room and using a pipe to bring the air to the PC. This of course is a ridiculous idea since the resistance of the pipe will dramatically reduce the air flow. But, if you can imagine an ideal imaginary pipe with no resistance! The air that moves out of the pipe and into the PC will go through obstacles like the grid or the components inside the case. This movement of air through obstacles creates noise. You cannot eliminate this kind of noise by changing the fan.

Thank you very much Mr. Obvious for clearing that up, we're all enlightned. :roll:

 

[Navid]

Originally posted by: sodcha0s

Thank you very much Mr. Obvious for clearing that up, we're all enlightned. :roll:

Whatever you say!
I'm not interested in trolling.