The NF-A12x25 PWM is the first fan to use blades manufactured from the new liquid-crystal polymer compound, branded by Noctua as Sterrox®. The main purpose of this new material is the reduction of material expansion with temperature and rotational forces.
The frame used with this fan is the Noctua AAO (Advanced Acoustic Optimization) which features stepped inlet present on all sides with accompanying dimpled microstructures to reduce turbulences. The fan itself has the following dimensions: 120 x 120 x 25 mm.
The blades are using the new Flow Acceleration Channels, three channels placed on each of the 9 blades. The main purpose of these channels is to reduce the noise that is generated by the airflow hitting the frame of the fan.
The gap between the tip of the blades and the inner side of the frame is just 0.5 mm, this reduces the possibility of a pressure drop, especially when the fan is used on a radiator. The small gap is possible thanks to the Sterrox® liquid-crystal polymer compound from which the blades are made from.
The fan is using the second generation of the self-stabilizing oil-pressure bearing or SSO2 Bearing. The hub and motor assembly are reinforced with metal to prevent any blade wobble and also reduce any unwanted noise caused by flexing.
The frame is equipped with the standard silicone pads attached on both sides of each corner. These are installed to reduce the vibrations produced by the spinning motor and the blades.
The inner surface of the frame features Inner Surface Microstructures to reduce the noise generated by the intake of air, while also increasing the suction capacity.
The back of the fan features 4 beams designed to offer low air resistance and also rigidity. The label that covers the back of the motor features the full model name of the fan alongside the Noctua logo.
The NF-A12x25 PWM uses a 4-Pin Molex connector just like most PWM capable fans, the cable is sleeved until the end with black rubber sleeving.