Hardware Spec Index

Teralux FN-3991 Pro 140mm PWM ARGB Case Fan (3-Pack)

Case Fans · Teralux · SKU FN3991-PRO · Released 2020 · Updated 2026-10-23

Key facts

Benchmark index967 (Case Fans scale)
Category rank#41,962
Street price$29
Power4 W
Performance per dollar33.34
Released2020

Specifications

BrandTeralux
ModelTeralux FN-3991 Pro
Size140 × 140 × 25 mm
Speed500–2,800 RPM (PWM)
Airflow134.4 CFM
Static pressure2.66 mmH₂O
Noise31 dBA
BearingRifle bearing
Connector4-pin PWM + 3-pin 5V ARGB
Rated lifetime150,000 hours

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Cite this page: Hardware Spec Index, “Teralux FN-3991 Pro 140mm PWM ARGB Case Fan (3-Pack)”, https://vextor7.com/item/16870871 (accessed 2026-10-23).