Cooling Fans for SERVER

hi there....
can anyone recommend me some good brands for Cooling purpose of my server.........?
i require some good brands of cooling fans for my server......
so can you suggest few......

Hewlett-Packard (HP) introduced new fans for blade servers that use a ducted design borrowed from remote-controlled model airplanes. Wade Vinson, a fan technologist at HP and the chief designer of the technology, said the fans have a more aggressive blade area, as well as a higher ratio of depth, which can produce more torque and higher cubic feet per minute. Vinson said he researched the idea and met with a local producer of high performance, radio-controlled model aircraft, who utilizes ducted fans, which normally have more and shorter blades than propellers, and therefore, can run at higher speeds.

The amount of airflow you can produce is incredible, adding that adoption will cut airflow needs in half, reduce noise, and reduce the power output. HP plans to launch the Active Cool Fans in the company's BladeSystem blade servers, the line that trails IBM by single digits for the market share lead. server lines.

Dynaeon server cooling fans provide 12.6cfm airflow:

Designed for use in 1U rack-mount servers, the DF1204BA-3 cooling fans from Dynaeon Ind. measure 40-by-40-by-28mm and provide a maximum airflow of 12.6cfm—claimed to be twice the airflow of traditional models.



The DF1204BA-3 fans have a noise level specified at 37dB. They are also rated for operation at 12Vdc, 0.19A. The cooling fans likewise consume 2.4W of power.

RA4001:

Technical Specification:

• 120x120x25MM
  
• BALL BEARING
  
• ALUMINUM HOUSING
  
• 115 CFM
  
• NOISE(db): 45

RA4007:

4 fans in a 1U 19 cage holder,

AIR BLOW UP OR DOWN W/ SENSOR & LCD CONTROL

Specification:

1. Dimension:19 x 11.3 x 1.75
   
2. 4 of 120mm fans installed
   
3. with on/off switch
   
4. with Temperature Sensor
   
5. with LCD Control
   
6. with 1U housing
   
7. 84 CFM
   
8. NOISE(db): 40