Hi,
For my case concept I need a quiet (or quietable) pusher fan that is 120 mm or more. It would be placed at the top of the case, exhausting warm air through a duct (~19 cm wide and ~3 cm height) that's over the PSU. It would be nice to have the pusher fan ducted (for the intake) to the CPU heatsink...

What is a pusher fan?

Something like this?

Damn, I couldn't find the right term for it!
Maybe 'blower' would be better suited, it was used in the review of the Clever Power PSU...
The AC Silencer fans are this kind too, they push air sideways through a duct - the GPU heatsink is in this duct - in my concept it would be a much larger fan and duct placed on top of the case, above the PSU.

Well, I made a crude ASCII drawing of the concept, please be gentle...

------------------------------------------------┐
<-``<-``<-``<-``<-{``I```I```I``}I
---------------------------`````````````┘
-------------------------┐``î``î``î``î``î``
<-``````````````I
<-`````PSU``````I
<-``````````````I
--{``I```I```I``}-┘
```î``î``î``î``î``

The idea is to have another low-noise fan than the standard 120 mm in the back and the one in the PSU. The three fans would provide the same airflow at lower noise (overall). And to minimise space usage, it would only require about 3cm over the PSU compared with 12cm in a vertical position.

Edit: the spaces got messy, so I had to replace them with something else

Not fully on topic -- I think the fan type is called a tangential fan (as opposed to axial fans).

"Street talk", they are indeed called blowers, sometime "squirrel cage" blowers for obvious reasons. Though the one you have linked is much longer and thinner than what is usually thought of.

What is usally thought of when the term blower is used:

http://www.airflow-usa.com/db-images/la ... ompact.jpg
http://www.employees.org/~slf/images/fannage1.jpg

In the computer relm, blowers are only usually used by extreme-overclocking watercoolers. The blower's ability in high-restrictive environments i.e. heatercores is why it's often the choice for such sectors.

I know of no SPCR-level quiet blowers and current recommend the AC fan mentioned in the stick thread for high pressure scenarios (to those who don't mind working with AC).

DrCR

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Thank you for the answers.
The 'blowers' above aren't exactly what I want. An enlarged version of the AC Silencer - without the GPU heatsink - would be best. Or a large and quiet (quietable) exhaust blower, like one by Akasa (that one is of course not quiet, and it's smaller than what I have in mind).
My point is that if one needs ~70cfm for exhaust, that could be split between a 1,000 rpm 120m fan and this 'blower'. The resultant noise would be ~24 db, while a single 2,000 rpm 120 mm fan would generate ~36 db.

Something like what's in the Mac Mini, perhaps?

If you look in the Papst catalog you get this 180x180x40mm radial fan (pdf!). But it is rated as more than twice as loud as their 80mm axial fans. Undervolting it would probably make it less noisy, but how far that would go?

The pic i posted is the fan you can get as an option to the CM Stacker case.

I found this in a local stores catalog, Titan TTC-005 Double Blower, 21.58CFM and 2800RPM, no mentioning of noise. There is no decent picture of that one, but the one linked below is the same but just half the size of the one im talking about. The bigger one costs 7,1€ so not that much. I think im going to buy one just to test it

http://www.verkkokauppa.com/productimag ... 318_01.jpg <--- HIGH RES pic

Heres the Titan site, www.titan-cd.com

A working pic link here

Something like this would be dubbed a "slot blower," again for obvious reasons. Many companies make them. I think I have a boxed Antec one somewhere around here at work. I'll have to dig around.

Yeah, I noticed CM Stacker's blower when the first reviews of it started popping up online. I don't know how quiet it is though.

I know Sunon make a MagLev 120mm blower, but I never did buy one. I think directron.com might sell it. You can do a forum search on it along with my user name if you want. I posted about it a while back. Sorry I don't have the time to find a link myself for you.

DrCR

_________

Thank you again for the answers.
The standard 'slot blowers' are 70-80 mm and obviously loud in order to get good airflow. I am interested about that 120 mm blower by Sunon, I'll try to locate it.
After looking at some 'slot blower' pictures I noticed that some are using a conventional (axial) fan and just shroud it. I'm not sure if that shrouding would work with a standard (axial) 120 mm fan...
The Papst has 48 db at 1,750 rpm, I don't see how it could be quieted.

Well, after looking at several large blower fans (Papst, Sunon, Delta) it is now obvious that none is quiet or even quietable. And at the same rpm as an axial fan they only get 40% (at best) airflow. So my idea with this large blower fan (above the PSU) exhausting air is worthless

Yeah, it would probably be better to make a top blowhole or something. Or maybe if you are adventurous, you could mod your case and move your PSU up to the top, and put a extake fan underneath it.

Here's a link to that Sunon blower if you want to check it out:
http://store.yahoo.com/directron/12plb2.html

The top blowhole is something I want to avoid at all cost. But you gave me an idea (well, I'm not going to actually do it, I need my computer for programming...): move the PSU about 5-6 cm towards the front of the case, turn it 90 degrees to the right to exhaust air through the righ panel of the case (requires cutting an adequate hole), add the second exhaust 120 mm fan where the standard PSU position was. Maybe THAT is not a bad idea!

Have you seen CF-1009...Bluefront's Ultimate Case Mod.

If you can't make room for a 120mm fan between the PSU and the back of the case, you could try 2x80mm fans. A setup like this saves you from cutting a hole in the side of the case.