Hardware Spec Index

Zephyra FN-3991 Plus 140mm PWM ARGB Case Fan

Case Fans · Zephyra · SKU FN3991-PLUS · Released 2023 · Updated 2026-10-22

Key facts

Benchmark index1,377 (Case Fans scale)
Category rank#12,921
Street price$49
Power3 W
Performance per dollar28.10
Released2023

Specifications

BrandZephyra
ModelZephyra FN-3991 Plus
Size140 × 140 × 25 mm
Speed500–2,300 RPM (PWM)
Airflow110.4 CFM
Static pressure2.19 mmH₂O
Noise34 dBA
BearingFluid dynamic bearing
Connector4-pin PWM + 3-pin 5V ARGB
Rated lifetime100,000 hours

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Cite this page: Hardware Spec Index, “Zephyra FN-3991 Plus 140mm PWM ARGB Case Fan”, https://vextor7.com/item/8106669 (accessed 2026-10-22).