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What is the best 140mm Noctua Case fan?

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August 11, 2013 11:56:00 PM

Noise isnt really an issue with noctua fans so any fan they have will do. But I would like to know the best fan for airflow using as an intake. I have a fractal design define r4 so the front intakes have quite restricted airflow. I've done some research and found that the NF-P14 is good for air restricted areas, but i saw on the noctua website that the new NF-A15 is an upgraded version of the NF-P14. Should i go for the NF-A15? Or do i have this all wrong?

More about : 140mm noctua case fan

a b K Overclocking
August 12, 2013 12:07:40 AM

Your Noctua case fan choice should be the NF-A14 FLX, specifically. The NF-A15 is a PWM fan meant for heatsinks.
August 12, 2013 12:32:25 AM

radiovan said:
Your Noctua case fan choice should be the NF-A14 FLX, specifically. The NF-A15 is a PWM fan meant for heatsinks.

Thank you for your quick response. Now I forgot to add that i will be using a fan controller, so do i still go with the NF-A14 FLX or the NF-A15 PWN. One more question, what would be the difference between the pwm and the flx versions of the fans?
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a b K Overclocking
August 12, 2013 1:17:12 AM
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Well, I said NF-A14 FLX specifically because there is a NF-A14 ULN and you do not want that one, since that one is a low-noise/less air-flow version.

The difference between an NF-A15 PWM and the NF-A14 is that the PWM is a 4-pin PWM fan that you would plug into a 4-pin "CPU_Fan" or a 4-pin "CHA_FAN" motherboard header, where it would be upto the mobo to regulate the fan's duty cycle. While the NF-A14 is a 3-pin fan and thus does not have the PWM (Pulse-width modulation) capacity. Hence, the main CPU heatsink fans are usually (but not always...like many older Noctua Heatsinks had only 3-pin fans) 4-pin PWM fans. Where as case fans don't need the fine-grain control of a CPU HS fan and thus are only 3-pin, so you end up controlling them through variable voltage.
August 12, 2013 1:21:42 AM

radiovan said:
Well, I said NF-A14 FLX specifically because there is a NF-A14 ULN and you do not want that one, since that one is a low-noise/less air-flow version.

The difference between an NF-A15 PWM and the NF-A14 is that the PWM is a 4-pin PWM fan that you would plug into a 4-pin "CPU_Fan" or a 4-pin "CHA_FAN" motherboard header, where it would be upto the mobo to regulate the fan's duty cycle. While the NF-A14 is a 3-pin fan and thus does not have the PWM (Pulse-width modulation) capacity. Hence, the main CPU heatsink fans are usually (but not always...like many older Noctua Heatsinks had only 3-pin fans) 4-pin PWM fans. Where as case fans don't need the fine-grain control of a CPU HS fan and thus are only 3-pin, so you end up controlling them through variable voltage.


Thank you for the clarification, i will be getting the NF-A14 FLX :D 
a b K Overclocking
August 12, 2013 1:29:21 AM

Albert0724 said:
radiovan said:
Well, I said NF-A14 FLX specifically because there is a NF-A14 ULN and you do not want that one, since that one is a low-noise/less air-flow version.

The difference between an NF-A15 PWM and the NF-A14 is that the PWM is a 4-pin PWM fan that you would plug into a 4-pin "CPU_Fan" or a 4-pin "CHA_FAN" motherboard header, where it would be upto the mobo to regulate the fan's duty cycle. While the NF-A14 is a 3-pin fan and thus does not have the PWM (Pulse-width modulation) capacity. Hence, the main CPU heatsink fans are usually (but not always...like many older Noctua Heatsinks had only 3-pin fans) 4-pin PWM fans. Where as case fans don't need the fine-grain control of a CPU HS fan and thus are only 3-pin, so you end up controlling them through variable voltage.


Thank you for the clarification, i will be getting the NF-A14 FLX :D 

Cool, hope it serves you well.
November 9, 2013 12:01:57 PM

I am going to be building my first pc next week and I ordered the same Fractal Design Define R4 case black pearl windowed version. And I also ordered 2 Noctua NF-A14 FLX's to use as intakes as the high pressure on them should be great for sucking air through the little side vents on the front of the case and pushing it through the double filter design.

I also bought an H100i so I shall take that original front case fan and slap that on the bottom mount next to the PSU. This way I will have the maximum number of fans on it :)  I may also in the future buy another NF-A14 to replace the bottom intake and I may even buy 2 NF-F12's to replace the H100i's SP-120's.

I was worried that this case wouldnt keep everything as cool inside as a different designed case seeing as how the intake set up has to come in from 2 little strips of vents on the front and then having to travel through the double filters and then get through the hard drive cages (although I will be taking the top one off) thats a lot of obstruction of the air but after doing a lot of research, these fans are very highly regarded and should be perfect for the job.
!