VTOL 4-in-1 ESC cooling fan

Had the first hover test today and the ESC quickly gets warm so I have arranged a 12V centrifugal fan to blow on the ESC, controlled by a PWM switch.
I see there is a servo function for auto flaps whereby the PWM output can be set depending on airspeed. This could work well to turn off the fan at a given airspeed.
Are there any pitfalls with this idea?

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