Hardware Spec Index

Zephyra FN-3921 Pro 120mm PWM Case Fan (3-Pack)

Case Fans · Zephyra · SKU FN3921-PRO · Released 2021 · Updated 2026-10-22

Key facts

Benchmark index706 (Case Fans scale)
Category rank#1,224
Street price$19
Power3 W
Performance per dollar37.16
Released2021

Specifications

BrandZephyra
ModelZephyra FN-3921 Pro
Size120 × 120 × 25 mm
Speed400–2,100 RPM (PWM)
Airflow71.4 CFM
Static pressure2.31 mmH₂O
Noise31 dBA
BearingMagnetic levitation
Connector4-pin PWM
Rated lifetime100,000 hours

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Cite this page: Hardware Spec Index, “Zephyra FN-3921 Pro 120mm PWM Case Fan (3-Pack)”, https://vextor7.com/item/576091 (accessed 2026-10-22).