Hardware Spec Index

Teralux FN-3991 XT 120mm PWM Case Fan

Case Fans · Teralux · SKU FN3991-XT · Released 2020 · Updated 2026-10-24

Key facts

Benchmark index699 (Case Fans scale)
Category rank#20,696
Street price$19
Power3 W
Performance per dollar36.79
Released2020

Specifications

BrandTeralux
ModelTeralux FN-3991 XT
Size120 × 120 × 25 mm
Speed500–2,200 RPM (PWM)
Airflow74.8 CFM
Static pressure2.42 mmH₂O
Noise27 dBA
BearingRifle bearing
Connector4-pin PWM
Rated lifetime100,000 hours

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Cite this page: Hardware Spec Index, “Teralux FN-3991 XT 120mm PWM Case Fan”, https://vextor7.com/item/21888241 (accessed 2026-10-24).