be quiet! Pure Wings 2 92mm, Cooling Fan

The plastics are really good, almost like carbon reinforced, tough, good quality, durable plastics!I tested the 80 and 91mm fans, at the extremes of my DC lab bench PSU.Here are the manufacturer's specs:Operating Voltages: 5-12VNoise levels: 18.6dBairflow: 33.15 CFMInput power: 3.84WInput current: 0.32ALifespan: 80.000 hoursHere are my personal power consumption measurments, and notices for the 80mm fan:2,80V 0.01A (~0.03W), kickstarting the fan is necessary; they don't provide much airflow until 3V.4,00V 0.05A (~0.20W), 4V is needed to self-start the fan.5.00V 0.06A (~0.30W), airflow ~= 3-4in.6.00V 0.08A (~0.50W)9.00V 0.10A (~0.90W), fan is barely audible in a silent room12.0V 0.13A (~1.60W), airflow =~ 1ft16.0V 0.165A(~2.65W)20.0V 0.22A (~4.40W), faint hum heard, ~1,5ft airflow24.0V 0.255A(~6.15W), not recommended for long exposure!30.0V 0.31A (~9.3W), audible, good airflow, 20 seconds in, the fan was fried, still works, but permanently suffered a 20-25% reduced performance.The 91mm fan's numbers:2,75V 0.04A (~0.10W), kickstarting the fan is necessary; they don't provide much airflow until 3V.4,00V 0.075A(~0.30W), 4V is needed to self-start the fan.5.00V 0.085A(~0.425W), airflow ~= 4-5in.6.00V 0.095A(~0.57W), airflow ~1/2ft.9.00V 0.135A (~1.20W), fan is barely audible in a silent room, airflow =~ 1ft12.0V 0.17A (~2.00W),16.0V 0.225A(~3.60W) ~1,5ft airflow20.0V 0.28A (~5.6W)24.0V 0.34A(~8.15W), Voltage not recommended, faint hum heard, ~2ft airflow.30.0V not tested.The manufacturer specs seem to be tested around 14-16V, but the real life numbers are better than specs!That's a good indicator it may be a good quality product!Personal fan rating:4.8 out of 5 stars, for airflow,4.9 out of 5 stars, for quietness (it's basically inaudible at operating voltages)4.8 out of 5 stars, for quality and durable plastics4.5 out of 5 stars, for under and over voltage capabilitiesLet's hope the brushes and bearings will live up to their 80.000 hours ratings.Overall, I would recommend these fans, if you're not into LED stuff!Definitely recommended!

Fans are quiet as expected .Replaced two older and less quiet fans with these.Night and day difference in noise level.

Bought this to fix a little mini fridge that uses this size of fan. Works great!

I have an 92mm arctic quiet fan that I had for a while, but it is rather noisy when it is at the high level of speed (around 1800-1900RPM). Maybe it is less noisy than a conventional fan, but it was noisy enough for me to look for another solution. And I think it was noisy because of the distance it was to the external grill plate on the back of the PC. If slackened the screws so it was a few millimeters from the screen, the noise dropped in half. This fan is much quieter at maximum speed (around 1900-2000 RPM). I have the speedfan program measure the RPM's. The performance in my particular PC is similar even though officially the 'be quiet!' fan moves less cubic feet of air at maximum speed according to the official specifications. But it feels like only a 5 to 10% difference in airflow when I put my hands to both. I have the 3 pin version.Update: The fan has started to make a little rattling noise occasionally. I examined the fan and I think the fan now goes up and down a tiny bit at certain speeds. Not bad for being quiet for 2 years.. and now only occasionally making a noise.