I've done PC grow boxes with LEDs and even dual 120mm Delta screamer fans did not provide enough airflow. Why? Because axial fans are not that good at moving air, you want squirrel-cage blowers or inline-centrifugal fans.

Dynex as a brand is horrible. I've blown out headphones, microphones, and many other components made by Dynex. They are cheap and fail too often, I would avoid those at all costs.