Hardware Spec Index

Zephyra FN-4921 Ultra 120mm PWM Case Fan

Case Fans · Zephyra · SKU FN4921-ULTRA · Released 2020 · Updated 2026-10-18

Key facts

Benchmark index273 (Case Fans scale)
Category rank#22,419
Street price$9
Power4 W
Performance per dollar30.33
Released2020

Specifications

BrandZephyra
ModelZephyra FN-4921 Ultra
Size120 × 120 × 25 mm
Speed400–2,800 RPM (PWM)
Airflow95.2 CFM
Static pressure3.08 mmH₂O
Noise31 dBA
BearingFluid dynamic bearing
Connector4-pin PWM
Rated lifetime50,000 hours

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Cite this page: Hardware Spec Index, “Zephyra FN-4921 Ultra 120mm PWM Case Fan”, https://vextor7.com/item/20126047 (accessed 2026-10-18).