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Edsai:
No, I opted for a 12v fan: https://tinyurl.com/y47oktve. I stepped the voltage down from 24v to 12V with this: https://tinyurl.com/yy325azq Then connected a variable speed motor before the fan: https://tinyurl.com/y28gvwv9

In the end, I decided that it's near impossible to get enough pressure through the filter and charcoal to guarantee a purge of the cabinet; that there is no way to tell when the charcoal is deactivated; and that the science of air scrubbing requires a lot more math to determine the amount of charcoal needed for a given CFM than I was willing to do.

So, while I'm quite impressed with jmillerfo's design and idea, I replaced the fan with a larger, 140mm, fan and printed the parts for a 5" window passthru to the exterior. (My printer sits in my workshop.) So, now I just vent directly outdoors. The fan speed controller allows me to balance cabinet temp with exhaust.