Hardware Spec Index

Brontix FN-9931 Ultra 120mm PWM Case Fan

Case Fans · Brontix · SKU FN9931-ULTRA · Released 2020 · Updated 2026-10-22

Key facts

Benchmark index643 (Case Fans scale)
Category rank#5,736
Street price$19
Power3 W
Performance per dollar33.84
Released2020

Specifications

BrandBrontix
ModelBrontix FN-9931 Ultra
Size120 × 120 × 25 mm
Speed400–1,600 RPM (PWM)
Airflow54.4 CFM
Static pressure1.76 mmH₂O
Noise29 dBA
BearingFluid dynamic bearing
Connector4-pin PWM
Rated lifetime50,000 hours

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Cite this page: Hardware Spec Index, “Brontix FN-9931 Ultra 120mm PWM Case Fan”, https://vextor7.com/item/7220893 (accessed 2026-10-22).