RAISING ELECTRONICS Rack Mount Digital Server Fan Cooling System with 4 Fans 1U

Works perfectly - quiet, easy to install. Exactly what I needed.

Functionally, it works but it's not quiet. It sounds like a hair dryer on a low setting and it's not something you'd want running in the same room. You can easily hear it through a closed door (or two) but at acceptable levels. The temperature control works but the analog dial does not provide much precision. Adjusting the temperature can actually trigger the relay. The unit is about 13.75" deep, but will require 17" to accommodate the included power cord. Mine did not include M6 Screws or cage nuts.

I mounted this in a rack that has a guitar tube amp. I am not sure about the temperature start function. I tired adjusting it down so that it will turn on when the amp starts to get hot, but it doesn't seem to be very sensitive. I don't really need this function though. I just needed something that would move a lot of air and this does exactly that. So for me, it is 5 stars.

I used this to assist air flow in my 6 foot server rack. My server rack is not located in an isolated temperature controlled environment, and unless I have the house A/C down to temperatures that would require me to wear a coat, I occasionally would hear my internal server fans kick up their speed as internal sensors detected temperatures that were out of thresholds. The build quality is good, fans are much quieter than my internal server fans, and pulls air up through the back of my server rack very well.

Wow, this thing is extremely loud. Mounted it in my rack in my home office. Build quality is good and seems like a solid product. Turned the unit on and, OMG! This thing is loud. Shut it off an uninstalled it. Cannot use this in a home office or AV rack setup. Too noisy. If you are using in a seperate server room than consider this product. Seems to move plenty of air and with the temp sensor seeming would keep your rack system at a near constant temperature.

Product description says it's 42dB but it actually measures around 70dB. Incredibly loud, but does move a lot of air.

I purchased this to cool a rack server that I have so that the fans will kick on to cool the server when the temperatures rise to a certain point. So far, this is working perfectly and I would definitely recommend.

The media could not be loaded. I'm setting up an equipment closet with a networking rack in my new house and my big concern has been ensuring I get enough cooling. I ordered this to avoid having fans on constantly and avoid having to create my own thermostatic venting solution as I have done in the past. This seemed like a good pre-built solution, although I'm not sure the thermostat will really do what it needs to do since the sensing appears to be on the front through the vents in the module rather than within the rack where the heat is. In addition, the fans are EXTREMELY LOUD, whether due to the fan design itself or cavitation from the punched metal vents, I can't say. As loud as they are, I'd expect them to be moving a lot more air than they are. Hopefully I won't hear this but the equipment room is right behind my media room, so if the wall isn't insulated well enough, this fan could be a problem. Sad since it could easily have been made much quieter and still move this amount of air.