The Alphacool Apex Stealth combines technical innovation with a timeless design. Thanks to its solid die-cast zinc frame and globally unique decoupling technology, this fan offers outstanding cooling performance with extremely quiet operation. Innovative Decoupling & Silence The heart of the Apex Stealth is the patent-pending decoupling system. The impeller, motor, and suspension are completely isolated from the frame. A special damping system effectively absorbs vibrations before they are transmitted to the case or radiators. Die-cast Zinc Frame: Provides maximum stability and a distinctive premium design. Closed Impeller: Prevents blade-tip fluttering at high speeds for optimized acoustics. HDB Bearing & 6-Pole Motor: Guarantees extreme smoothness and a long lifespan of 100,000h (MTBF). Versatile & Powerful With a control range of 200 to 2500 RPM and high static pressure, the Apex Stealth is the ideal choice for both case airflow and radiator cooling. Daisy-Chain: Multiple fans can be easily connected in series; cables hide neatly within the frame. Zero-RPM Control: Allows the fan to stop completely for silent office use. Technical Specifications Dimensions / Weight: 140 x 140 x 25 mm / 395 g Speed: 200 - 2500 RPM (PWM) Pressure / Airflow: 3.45 mmH2O / 93.9 CFM Noise Level (max): 37.6 dB(A)