Noctua NF-B9 redux-1600 PWM 92mm 1600 RPM 4-Pin PWM case fan

92mm PWM case fan for tight builds

The NF-B9 redux-1600 PWM is a 92mm square, 25mm thick case fan with a 4-pin PWM connector. It spins at up to 1600 RPM and delivers 37.85 CFM airflow at a maximum of 17.6 dBA. The SSO bearing and >150,000 h MTTF rating back long-term reliability in continuous operation. It suits builds that need quiet cooling in a compact frame.

Builders who need quiet 92mm cooling

This fan fits users replacing a noisy 92mm stock cooler or ventilating small-form-factor cases, NAS units and rack devices where 92mm mounts are standard. The PWM control allows automatic speed curves from the motherboard, so it runs near-silent at idle and ramps up only when thermal load demands it. It does not suit builders whose chassis only accepts larger frame sizes or who require higher static pressure for dense radiator stacks.

1600 RPM maximum speed defines the performance

The fixed 1600 RPM ceiling sets the upper bound for both airflow and noise. At full speed the fan moves 37.85 CFM while staying at 17.6 dBA, a balance tuned for general chassis ventilation rather than high-restriction heatsinks. If the cooling target needs more airflow than this ceiling provides, a faster or larger fan must be chosen.