Hardware Spec Index

Brontix FN-3691 Ultra 120mm PWM Case Fan

Case Fans · Brontix · SKU FN3691-ULTRA · Released 2025 · Updated 2026-10-22

Key facts

Benchmark index551 (Case Fans scale)
Category rank#9,334
Street price$19
Power3 W
Performance per dollar29.00
Released2025

Specifications

BrandBrontix
ModelBrontix FN-3691 Ultra
Size120 × 120 × 25 mm
Speed300–2,100 RPM (PWM)
Airflow71.4 CFM
Static pressure2.31 mmH₂O
Noise35 dBA
BearingFluid dynamic bearing
Connector4-pin PWM
Rated lifetime150,000 hours

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Cite this page: Hardware Spec Index, “Brontix FN-3691 Ultra 120mm PWM Case Fan”, https://vextor7.com/item/98694698 (accessed 2026-10-22).