My whole point here is to point out the absurdity of the question and elicit parameters useful in making a recommendation.
It's relatively easy to calculate the air flow to maintain a given temperature rise due to 100W. But that information is almost irrelevant in the current (lack of) context.
The internal heat sources will reach an equilibrium temperature to make that happen.
That may not be acceptable to those devices. The most precise info we have is the name of this newsgroup. I suggest that is insufficient specificity.
As an engineering manager, my most useful contribution was to shine a light on issues that the engineers ignored or swept under the rug that might result in the failure of their endeavor.
Often, the GUESS answer to a VAGUE question is not the most direct path to success.
My intent is not to give anybody a fish. My intent is to teach them HOW to fish... and what to do when they catch one... or suggest that chasing a chicken might be more productive in this context.