High performance 14cm fan with S-FLOW blades supplying 30% more airflow than a standard fan at the same speed. The greater performance combined with PWM automatic speed control allows the fan noise to be kept to a minimum.

The Viper fan creates more focused airflow providing blind-spot cooling, which makes it an ideal solution for a case or heatsink fan. HDB (Hydro Dynamic) bearings extend fan life and further enhances noise reduction. Killer Viper yellow color makes this fan distinctive and unique.

Note : Cable comes factory sleeved black, other colors are available in the options below.

• High performance 14cm fan in killer VIPER yellow color
• S-FLOW fan blade design delivers 30% higher airflow
• Super silent with PWM auto speed control
• Hydro Dynamic Bearing extends fan life up to 50,000 hours

Application:	PC case or heatsink fan
Dimension:	140 X 140 X 25mm
Fan speed:	600 -1600 RPM
Max airflow:	110.61 CFM (141.75 m3/h)
Max static air pressure:	3.12 mm H2O
Noise level:	12.5-26.01 dB(A)
Voltage rating:	12V DC
Bearing:	HDB (Hydro Dynamic)
Fan life expectancy:	50,000 hours
Connector:	4pin PWM
Product code:	AK-FN063

10-06-2020
Reviewer: Luscious (7)
This is coming from a build done in 2015 where these fans have been running 24/7. What I can tell you based on 5 years using these is that they are by far the choice to go to when you need serious radiator cooling. I have these mounted in push/pull on 80mm thick radiators and they literally will lift a heavy cloth towel placed over the top - not a paper napkin, an actual bath towel. Using your motherboards PWM control they can run near silent and at just under 1k RPM they are almost that. But compared to the fanciest QL140 RGB fans out there these come in at literally A THIRD of the price with more than double the static pressure and CFM airflow - that''s some solid bang for the buck right there. Ideally if you want to step up from these you would get a Noctua or Delta, but again, those are 3x the price if not more to get similar CFM/mmH2O. To complete my build I added Halos Lux fan frames for a splash of RGB. Definitely recommend these fans for price/airflow and they are unbeatable for radiator use. 50K hour MTBF means they will last at least 6 years running 24/7 before the bearing is shot. Yellow is also my favorite color LOL.

11-23-2014
Reviewer: eviltone (2)
... these things are louder than they say at full bore. the 3 i have in my Corsair Air540 (2 top, one rear) combined with the 3 CM pwm''s in front and the 2 CM pwm''s on the Noctua air cooler ... they''re louder than all 5 of those combined. and the CM''s are supposed to be louder per fan....

09-11-2014
Reviewer: erratic (6)
Good airflow and pretty much silent under 40%, but no matter the speed, always with a smooth acceptable tone.

05-08-2014
Reviewer: Mike (2)
Very high quality fan, well made, high cfm airflow, and whisper quiet. I have one as a secondary filtered intake, and one replaced my main rear exhaust. Whole case temps dropped 5degC overall, yes, everything in the case! I have them paired with some CoolJag 120 PWM''s, and my case has become a wind tunnel! I have a mild 4.2Gig overclock on my FX8350 Bulldozer and this fan setup is MORE than adequate to manage temp spikes. My first time experience with Frozen was a pleasure, and has insured I will shop with them again.

08-29-2013
Reviewer: Marcin (2)
I needed to replace my stock H110 fans since one was making an noise at higher rps. Searched around and came across these Akasa Vipers. So far I''m pleased with these fans they perform great, and I don''t hear any odd noises or ratlles like I did with my stock H110 fans. The price is great, the quality is there, the fans are well built. Anyone looking for a replacement 140 mm radiator fans I would highly recommend these. They do the job while looking cool. Marcin