Hardware Spec Index

Teralux FN-3991 Prime 140mm PWM ARGB Case Fan

Case Fans · Teralux · SKU FN3991-PRIME · Released 2025 · Updated 2026-10-26

Key facts

Benchmark index1,236 (Case Fans scale)
Category rank#7,599
Street price$39
Power3 W
Performance per dollar31.69
Released2025

Specifications

BrandTeralux
ModelTeralux FN-3991 Prime
Size140 × 140 × 25 mm
Speed400–1,800 RPM (PWM)
Airflow86.4 CFM
Static pressure1.71 mmH₂O
Noise25 dBA
BearingMagnetic levitation
Connector4-pin PWM + 3-pin 5V ARGB
Rated lifetime150,000 hours

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Cite this page: Hardware Spec Index, “Teralux FN-3991 Prime 140mm PWM ARGB Case Fan”, https://vextor7.com/item/6482376 (accessed 2026-10-26).