this fan works well for cooling.. silent innexpensive and dropped it about 14 degrees on average.
https://www.amazon.com/dp/B00G05A2MU?psc=1&ref=ppx_yo2ov_dt_b_product_details
you can see drop here... i have it on the lowest speed of the 3 available.
As far as the temperature effect on the semiconductors, the dominant failure mechanisms are:
In theory, if the devices sat at 100 °C steady they would last "forever".
I would also be wary of having a PWM controlled brushless motor near radio circuitry.
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