This is an add on feature for any tall profile light panel (2" height).
Add one, two or even more fans to generate airflow under the light panel and across your top vents.
If you're ordering a panel which already has a large diode on a heatsink, one of these fans will be installed by default to cool that diode, but additional fans can be added if you're looking for a lot more airflow across the top of your display.
These fans are plug/play replaceable so they can easily be swapped out when they eventually fail or get noisy.