Noctua NF-A15 and NF-A14 Cooling Fan Review

backside fanstack 2x NF14 UNL

NF-A15 PWM

Moving on to the NF-A15 PWM: This is a 150mm fan with the footprint of a 140mm one.  Its total width is 150mm (hence the A15) but its height is only 140mm so it will fit most high-end CPU coolers (fits perfectly on a NH-D14).  What also needs to be noted is that the spacing for screwing these fans into place is the standard 120mm fan mounting holes.  In summary if your cooler can hold a 120mm fan you can replace it with this 150mm one! Instant upgrade for little money, or just bolt it to the side of a case panel for extra ventilation.

It also implements its own PWM chip to reduce noise made by the extra strain the motor would make when turned on and off, instead they found a chip that ramps it up and down with a little fade in and out so to speak, quote:

Custom designed PWM IC with SCD

Supporting fully automatic PWM speed control, the NF-A15 PWM uses Noctua’s novel, custom designed NE-FD1 PWM IC that integrates Smooth Commutation Drive (SCD) technology. By providing smoother torque impulses, SCD suppresses PWM switching noises and thus makes the fan quieter at low speeds


I will have to tell you that I actually double-checked Noctua’s website as I wanted to align the holes with the 140mm ones but found out I had to use the 120mm holes. That raised an eyebrow when I first put it up to the panel.

 

Don’t get me wrong: the fans’ impeller is slightly bigger than the 140mm one thus moving more air.  It has all the features of the 140mm fan like the AAO Frame, stepped inlet, Inner Surface Microstructures (just a fancy way of saying “golf ball like dimples on inside”), Flow Acceleration Channels (hey I didn’t mention that in the 140mm fan but they obviously have it as well).