Question 1

We purchased 3 of these fans. The manual I found showed 2 wires fro connection and ours have 3 wires What is the third wire for?

Accepted Answer

If your wires are red, yellow, and blue, they correspond to 12v, sense, and ground, respectively.

If your wires are black, yellow, green and blue, they are ground, 12v, sense, and control.

Question 2

How do I run these on DC power? I have 3 of them and don't want to power them through my Server. I tried using a 15 amp chord, but did not get power when wiring the cord to the fan.

Accepted Answer

This is a fairly high volume (CFM) fan.  It is a 12VDC fan rated at 4A.  The fan has two leads red (+) and black (-).  You must use a DC voltage source.  If you get the leads reversed it will run backwards.  By "through my server" do you means off the FAN1-n connects on its motherboard?  If you want to run it on a source external to the server you will need a simple dc power supply with a molex 4 pin connector and a few 4 pin fan header connector cables.

All you need is a discarded pc power supply or a power adapter from an old router rated for 12VDC and a few (not more than 2-3) amps.  Adapt the power adapter to a molex connector and you are go to go!  You will be running this fan with no speed control so expect high air volume and 66dB of noise.

R, AZSalty

Question 3

Is there a quiet mode?

Accepted Answer

No... but I’m not using the fan on a computer...but I do have it connected to a controller to adjust the power ...at lower power settings, it is quieter but normally it’s just either on or off

Question 4

Help! 
I need a controller for this fan. One that's actually around the 50w that this fan needs, preferably something simple (don't need lcd screens or anything of the like).
Can anyone please point me in the right direction?
Thanks!

Accepted Answer

for up to 4 fans, Lamptron FC-FC9B

For just 1fan, Yeeco DC Motor Speed Control Driver Board 3V-35V 5A PWM Controller Stepless DC 3V 6V 12V 24V 35V Variable Voltage Regulator.

The Yeeco requires you to fabricate a mounting platform and power interface.  I just used 16ga wire and connected to a molex connector.  Be sure to pinout the connector first to avoid mixed polarity.
I just drilled a hole into a blank expansion card slot cover and mounted it there.  You could mount the Yeeco anywhere really, but you just have to put a hole in your material.

I have both and both have worked great.

Hope this helps.

Question 5

How to connect this to my PC? Let me see if I understand... The molex is what I connect to the PSU. And the 3-pin fan header to the motherboard?

Accepted Answer

Yes, however, if you do that, the fan will run at full speed all the time.  At 66.5dba, the sound is intolerable for most office/desk workstations.  For that type of config, it's best to run the fan in a server closet, or switch room.  I reccommend a 50w/fan fan controller to regulate the noise and airflow.

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