Well, actually they would be brown Noctuas, but they are even more expensive, and these are _almost_ no worse. Excellent silent fans with high static pressure and excellent airflow. The only downside is that they are a bit expensive. They don't have such small touches as the anti-vibration pads on their "brown" counterparts. You can use them for case fans, but they're ideal for forcing air through a grille where there's some drag. overcome. If drag is low, there are better options with even less noise and higher CFM. For this use case, the straight blade, low RPM, and ultra-low noise Noctuas is probably better.
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