Hardware Spec Index

Zephyra FN-3991 Ultra 120mm PWM ARGB Case Fan

Case Fans · Zephyra · SKU FN3991-ULTRA · Released 2025 · Updated 2026-10-24

Key facts

Benchmark index1,111 (Case Fans scale)
Category rank#33,841
Street price$39
Power3 W
Performance per dollar28.49
Released2025

Specifications

BrandZephyra
ModelZephyra FN-3991 Ultra
Size120 × 120 × 25 mm
Speed400–1,500 RPM (PWM)
Airflow51.0 CFM
Static pressure1.65 mmH₂O
Noise25 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”, https://vextor7.com/item/226711 (accessed 2026-10-24).