Panasonic asfn9 series axial dc brushless fans 92 x 92 x 25mm panasonic asfn94392 this 24v dc axial brushless fan from the panasonic asfn9 series measures 92 x 92 x 25mm and has an operating speed of 1700rpm this model has a sensor which detects when the fan is blocked panasonic asfn94392 axial 24v dc brushless fan 1700 rpm 92 x 92 x 25mm sensor