Hardware Spec Index

Brontix FN-3991 Plus 140mm PWM ARGB Case Fan

Case Fans · Brontix · SKU FN3991-PLUS · Released 2021 · Updated 2026-10-23

Key facts

Benchmark index1,219 (Case Fans scale)
Category rank#22,804
Street price$39
Power4 W
Performance per dollar31.26
Released2021

Specifications

BrandBrontix
ModelBrontix FN-3991 Plus
Size140 × 140 × 25 mm
Speed400–2,800 RPM (PWM)
Airflow134.4 CFM
Static pressure2.66 mmH₂O
Noise31 dBA
BearingMagnetic levitation
Connector4-pin PWM + 3-pin 5V ARGB
Rated lifetime50,000 hours

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Cite this page: Hardware Spec Index, “Brontix FN-3991 Plus 140mm PWM ARGB Case Fan”, https://vextor7.com/item/91492792 (accessed 2026-10-23).