Hardware Spec Index

Zephyra FN-3991 Prime 120mm PWM Case Fan

Case Fans · Zephyra · SKU FN3991-PRIME · Released 2024 · Updated 2026-10-23

Key facts

Benchmark index647 (Case Fans scale)
Category rank#44,515
Street price$19
Power3 W
Performance per dollar34.05
Released2024

Specifications

BrandZephyra
ModelZephyra FN-3991 Prime
Size120 × 120 × 25 mm
Speed200–1,500 RPM (PWM)
Airflow51.0 CFM
Static pressure1.65 mmH₂O
Noise23 dBA
BearingMagnetic levitation
Connector4-pin PWM
Rated lifetime100,000 hours

Related guides

AIO Liquid Cooling vs Air Cooling for CPUs

Similar Case Fans

ModelBenchmarkPriceCompare
Brontix FN-7248 Prime 120mm PWM ARGB Case Fan (3-Pack)1,170$39Compare
Teralux FN-4460 Ultra 120mm PWM ARGB Case Fan (3-Pack)1,166$39Compare
Brontix FN-4541 Pro 120mm PWM Case Fan (3-Pack)732$19Compare
Zephyra FN-8381 Ultra 140mm PWM Case Fan578$19Compare
Corvane FN-1239 Ti 120mm PWM ARGB Case Fan (3-Pack)1,296$49Compare
Caldera FN-7818 Prime 140mm PWM Case Fan480$19Compare

All Case Fans · JSON

Cite this page: Hardware Spec Index, “Zephyra FN-3991 Prime 120mm PWM Case Fan”, https://vextor7.com/item/1907211 (accessed 2026-10-23).