The supplied 3-way splitter cable allows the connection of up to three 4-pin PWM fans in order to control them simultaneously. If the small push button is pressed and the green status LED is on, the NA-FC1 operates in “no stop” mode, which means that it will not allow the fan to fall below 300rpm, regardless of the speed setting and the input PWM duty cycle from the motherboard, thus avoiding BIOS fan errors.* Using the NA-FC1, you can lower the motherboard’s PWM control curve in order to achieve truly silent operation, even with high-speed PWM fans such as Noctua’s industrialPPC series. Many motherboards provide insufficient options to customise automatic fan control or simply don’t go below certain duty cycles and speed levels. This makes it ideal for manually slowing down high-speed PWM fans such as Noctua’s industrialPPC series in order to achieve consistently quiet operation. If the NA-FC1 doesn’t receive an input PWM signal from the motherboard, it works as a simple and efficient manual controller that allows the duty cycle to be set from 0 to 100%. While most fan controllers are voltage based, the NA-FC1 uses the more sophisticated Pulse Width Modulation (PWM) technique that allows for more efficient control and lower minimum speeds, regardless of the fan’s starting voltage.

Noctua fan control