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Cooler is better, especially for 'lytics - their life is directly affected by temperature. I think you have to look at each chassis to see how to get the airflow to the hotspots (maybe not the Predictas or tightly packed portables that are so closed-in that anything could help).
I think *depending* on a fan to protect a flyback is iffy - the current should be within limits first, and in that case it won't burn up anyway. Adjusting line voltage to keep B+ and high voltage normal is also more important than airflow if the flyback isn't getting warm from excess current.
Edit: Bottom line about fans: "it couldn't hurt."
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