Hardware Spec Index

Zephyra FN-3991 Ultra 120mm PWM ARGB Case Fan (3-Pack)

Case Fans · Zephyra · SKU FN3991-ULTRA · Released 2019 · Updated 2026-10-21

Key facts

Benchmark index1,254 (Case Fans scale)
Category rank#48,848
Street price$49
Power4 W
Performance per dollar25.59
Released2019

Specifications

BrandZephyra
ModelZephyra FN-3991 Ultra
Size120 × 120 × 25 mm
Speed300–2,500 RPM (PWM)
Airflow85.0 CFM
Static pressure2.75 mmH₂O
Noise34 dBA
BearingMagnetic levitation
Connector4-pin PWM + 3-pin 5V ARGB
Rated lifetime100,000 hours

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Cite this page: Hardware Spec Index, “Zephyra FN-3991 Ultra 120mm PWM ARGB Case Fan (3-Pack)”, https://vextor7.com/item/8669798 (accessed 2026-10-21).