Hyper Fans Laminar Flow Fan Blade & Stator Technology create optimal airflow similar in design to an airplane jet engine. The result is very high CFMs and exceptional static pressure performance. The Hyper Fan® Stealth delivers the highest CFMs per watt of any silenced fan in the industry. The same state-of-the-art digitally controlled electronically commutated motor (ECM) and heavy-duty sealed ball bearings which make the original Hyper Fan® so reliable and quiet, are combined with our silencing canister and lightweight acoustic foam in the Stealth series. This results in a reduction of 15 dbas which is perceived to the human ear as 75% quieter. Like the original Hyper Fan®, the Stealth fans use 50% less power than traditional fans. A speed controller and integrated mounting brackets are included.