The NF-A4 industrialPPC 24V fans from Noctua are conceived for industrial applications which require enhanced cooling performance and advanced ingress protection. Versus the regular 12V versions, the 24V model is using a dedicated wire input range version of the Noctua’s NE-FD2 motor driver IC so it can support 24V-based industrial applications. These fans can be, of course used in PC builds too and running them at 12V halves the rotation speed while maintaining a good performance at very low noise levels.

Each fan is individually packaged in a separate cardboard enclosure, which features the Noctua iconic color scheme and the name of the product on the top cover; the motor and PCB of this IP67 version we have got for evaluation are completely cast in a special, highly heat-conductive resin that combines throughgoing protection and effective motor heat dissipation:

More advanced product technical specifications can be checked out on the bottom area of the cardboard box:

Inside we will get to see the fan, surrounded by a black cardboard frame so it won’t move during transit:

Noctua has also included silver mounting screws in a separate transparent plastic bag:

Let’s take a closer look at the fan itself! NF-A4 industrialPPC 24V is built from a fibre-grass reinforced polyamide (both impeller and the frame) for withstanding temperatures up to 140 degrees Celsius, but this aspect also makes the fans more robust and break-proof:

Flow-acceleration channels are provided on each blade; by speeding up the airflow at the crucial outer blade regions, we are reducing suction side flow separation and leads to better efficiency and lower vortex noise:

Thanks to the stepped inlet design, turbulence is added to the influx in order to facilitate the transition from laminar flow to turbulent flow, which reduces tonal intake noise, improves flow attachment and increases suction capacity:

The NA-SAVP1 anti-vibration pads in brown color are attached in each corner of the fan (8pcs per fan):