We began our quest for better measurements by starting with the most obviousĮrror: The Arctic Fan 12. The excerpt below from Laboratatory Methods of Testing Fans for Aerodynamic Performance Rating, document ANSI / AMCA STANDARD 210, shows just how complex such tools can be. The cost of these tools runs into many thousands of dollars, possibly into the tens of thousands.
Are these differences real or errors caused by our measurement technique? With the feedback on the Noctua fans, we weren’t sure.įan manufacturers use complex multichamber testing tools to measure airflow. Ratio that is significantly different with other fans of similar size.
FAN AIRFLOW DIRECTION PRO
SilenX’ Ixtrema Pro series, with their wide, scooping fins and tinyĪll of these are problem cases because our standard measurements show an RPM-to-Airflow.The Noctua NF-S12 series.with their very thin fins.These fans spin in the opposite direction of the impeller of our anenometer. Arctic Cooling’s frameless, reverse-direction Arctic Fan 12L andĪrctic Fan 3 we reviewed last November.
Than most fans, but we discovered several other quirks that seemed to affect Of the Noctua, that quirk is thin, propeller-like fins with a sharper pitch Noctua: They have some quirk that sets them apart from other fans. The ones that cause problems are like the To the best of our knowledge, our technique of holding anĪnemometer directly in front of the fan to find the peak airflow works perfectly To build what we couldn’t buy, and the strange device you see above was the Seem to be working, we needed to get creative. Since our recommendation assumes that higher airflow normally leads to lower temperatures, these reports cast our measurementsĬould a fan that we measured as having higher airflow provide poorerĪnemometer directly in front of the fan to find the peak airflow didn’t Very quiet, some users were noticing their system temperature going up, not down. We were surprised when reports began to surface that, while the Noctua was indeed NF-S12 series as the fan with the best airflow-to-noise ratio. Most recently, we identified the Noctua’s These situations don’t arise often, but we take
FAN AIRFLOW DIRECTION FULL
We make a recommendation, peopleįorum is full of people complaining that our recommendation didn’t Neither the photo nor this article would exist if it weren’t for theįact that, occasionally, we get things wrong. What is that in the photo below? Three guesses - no cheating!Ī hint? Remember the title of the article.
After much experimentation and some test methods that were rejected, we settled on a new way of assessing fan airflow under some load (impedance) that seems more consistent and reliable. In spite of our best efforts, some SPCR readers found fault with a few of the airflow measurements in our recent fan roundups.
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