Hardware Spec Index

Brontix FN-3991 Prime 140mm PWM ARGB Case Fan

Case Fans · Brontix · SKU FN3991-PRIME · Released 2024 · Updated 2026-10-19

Key facts

Benchmark index1,159 (Case Fans scale)
Category rank#43,609
Street price$39
Power4 W
Performance per dollar29.72
Released2024

Specifications

BrandBrontix
ModelBrontix FN-3991 Prime
Size140 × 140 × 25 mm
Speed500–2,700 RPM (PWM)
Airflow129.6 CFM
Static pressure2.56 mmH₂O
Noise35 dBA
BearingFluid dynamic bearing
Connector4-pin PWM + 3-pin 5V ARGB
Rated lifetime50,000 hours

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Cite this page: Hardware Spec Index, “Brontix FN-3991 Prime 140mm PWM ARGB Case Fan”, https://vextor7.com/item/6026366 (accessed 2026-10-19).