Sparks and flames are always bad...
Lot of people are right on the edge...I've replaced many a light fixture that had too high a wattage bulb in it, or was just plain too hot for the location (bad design usually, no or not enough ventilation).
The area above or behind (wood) is charred and black, just a miracle they didn't flame and spread...
Anytime something gets hot, and it is against combustable material, it is a real risk to just "hope for the best".
If it is to uncomfortable to leave your hand on it, it is too hot.
Anyway the fan currently runs all the time when hooked to shore power.
It is small and quiet and could easily be switched, trouble is, I'd forget to turn it on, and the charger gets too warm for comfort.
I have it mounted to the plywood wall, but also have it spaced out 1/2" to allow some natural airflow, and have a small vent in the floor below it.
The louvered vents Danny has pictured are available at most home repair centers.
Ask for "round soffit vents" they come in several sizes, and materials.
Aluminum being the most readily available.
Not sure about SS. but copper is, and looks good!
PS. Just for fun...most of the time when someone posts a commercial picture of a part (a "borrowed" picture) you can right click on the image, and click on "properties" to get the companies URL.
Just remove everything after the .com and you will be taken to the site that posted the picture...which gives you all the info you want.
Picture URL with just the company info.