Scythe Kama Flow 2 120 (SP1225FDB12L and SP1225FDB12M)
Scythe Co., Ltd. Japan has three models in this test session. First goes the Kama Flow 2 120. Like the Noiseblocker (see above), this fan has a rated speed of 1400 RPM and doesn’t formally fit into this review, yet it proved to be so exceptionally quiet that I am going to discuss the SP1225FDB12L (900 RPM) and SP1225FDB12M (1400 RPM) here. The senior model with a rated speed of 1900 RPM will be tested in our next review.
Traditionally for Scythe products, the package is a transparent plastic wrap with a paper insert.
There is a lot of text on the insert just as you can see in the photo. One PATA power adapter and four mounting screws are included with each fan.
Despite its Japanese roots, the Scythe Kama Flow 2 120 is manufactured in China. The recommended price of this model is $16.8. The warranty period is 2 years.
The frame and the 7-blade impeller are totally black.
The Scythe Kama Flow 2 120 weighs 169 grams. Its impeller is 113 millimeters in diameter (the largest in this test session). Three of the fan spokes are 5 millimeters wide; the cable spoke is 8 millimeters. The rotor is 48 millimeters in diameter (the largest in this test, too).
The impeller has seven sharp blades with characteristically thick ends and slim front edges. The angle of attack is large.
There are two ribs on the interior of the frame, diverging from each other. The two Scythe Kama Flow 2 models are specified to have a rotation speed of 900 and 1400 RPM. Their declared air flow is rather weak even for such speeds, equaling 30.5 and 47.5 CFM, but the noise level is low at 11 and 27.6 dBA, respectively.
An extra fluid dynamic bearing (EX-FDB) hides below the sticker.
The bearing has a service life of 120,000 hours. The current of 0.3 amperes you can see on the rotor and in the fan specs indicates a peak power draw of 3.6 watts but the two Scythe Kama Flow 2 120 fans did not consume more than 0.62 and 1.11 watts in my tests. The start-up voltage was very low at only 4.6 volts for the SP1225FDB12L and 3 volts for the SP1225FDB12M. The power and speed monitoring cable is 300 millimeters long. I can also add that the Kama Flow 2 series includes 92 and 80mm models, too.
Let’s see what results the two Kama Flow 2 120 fans achieved in my tests:
The results are fantastical, especially those of the junior model! There is no other fan in this review to produce only 31.4 dBA of noise at a rotation speed of 1040 RPM. The Japanese firm has developed a very quiet fan that becomes the leader of this review, outperforming very strong opponents in terms of air flow and noisiness combined. Yes, the opponents are very close behind, as you will see in the summary diagrams, yet the Kama Flow 2 is indeed the best fan of this test session.