Hardware Spec Index

Zephyra FN-4991 Prime 120mm PWM Case Fan

Case Fans · Zephyra · SKU FN4991-PRIME · Released 2020 · Updated 2026-10-26

Key facts

Benchmark index790 (Case Fans scale)
Category rank#25,511
Street price$29
Power3 W
Performance per dollar27.24
Released2020

Specifications

BrandZephyra
ModelZephyra FN-4991 Prime
Size120 × 120 × 25 mm
Speed300–2,100 RPM (PWM)
Airflow71.4 CFM
Static pressure2.31 mmH₂O
Noise22 dBA
BearingFluid dynamic bearing
Connector4-pin PWM
Rated lifetime100,000 hours

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Cite this page: Hardware Spec Index, “Zephyra FN-4991 Prime 120mm PWM Case Fan”, https://vextor7.com/item/9585709 (accessed 2026-10-26).