Hardware Spec Index

Brontix FN-3991 XT 120mm PWM Case Fan

Case Fans · Brontix · SKU FN3991-XT · Released 2024 · Updated 2026-10-19

Key facts

Benchmark index390 (Case Fans scale)
Category rank#5,340
Street price$9
Power3 W
Performance per dollar43.33
Released2024

Specifications

BrandBrontix
ModelBrontix FN-3991 XT
Size120 × 120 × 25 mm
Speed300–1,600 RPM (PWM)
Airflow54.4 CFM
Static pressure1.76 mmH₂O
Noise32 dBA
BearingMagnetic levitation
Connector4-pin PWM
Rated lifetime100,000 hours

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Cite this page: Hardware Spec Index, “Brontix FN-3991 XT 120mm PWM Case Fan”, https://vextor7.com/item/16385751 (accessed 2026-10-19).