BL138 be quiet! Pure Wings 3 White 140 PWM High-speed

Motor with closed-loop technology for consistent speeds

The Pure Wings 3 140-mm PWM high-speed has a closed-loop motor. This technology is comparable to the cruise control in cars. If the fan is operating against a resistor, such as a fan grille or radiator, it will spin more slowly. A closed loop continuously monitors the current fan speed and increases it to the target speed if necessary. As a result, the Pure Wings 3 140-mm PWM high-speed always works at the desired speed, regardless of the resistance.