Included three-phase PWM speed controller allows you to switch modes according to different hardware environments and scenarios. Under all 3 modes Nova is able to stop operating when PWM signal is below 6%. A strong neodymium magnet is placed at the bottom of the fan frame, perpendicular to the shaft. This magnetic structure effectively mitigates displacement due to centrifugal force during high-speed operation, thereby reducing fan vibration and ensuring more stable fan operation. Dust-proof structure encloses the internal drive components, preventing entrance of dust or debris corroding electronic components inside, thus extending the lifespan of the fan. Overall structural enhancement strengthens the fan frame rigidity and reduces resonance. The contact area between the fan frame and the corner is only 7mm wide, reducing by 72%, which significantly reduces resonance and noise. 8 anti-vibration rubber pads efficiently reduce vibration and noise. The clearance between fan frame and blades is minimized to 0.5 ± 0.1mm to increase the effective cooling area, avoids fan backflow and enhances air pressure.