With the understanding that it's a fan and not a dehumidifier, if you're in a tent/box and its in a room that is less humid than what's going on in the tent, you can alter/control the humidity up to a certain point.
For example, the room that my tent resides in for the winter is currently at 40% RH. My tent if left to itself without ventilation might be in the 50-70% range...bringing the drier air in and pushing some of the moisture out will lower tent humidity (note that it also affects temperatures so that makes it a balancing act). So you need to figure out where the airflow is such that you're not sucking ALL the humidity out and matching your outside environment but enough that you're not creating a sweatbox in the tent. The AC Infinity controller can do this effectively.
Now on the other hand, during the summer, when the room my tent is in is super humid...I run a pair of dehumidifiers to bring the ambient air RH down to 40% then use the fan in the same way.
Also, I prioritize temperature over humidity. I'd rather work to keep my 'lights on' temps in the 75-83f degree range, if doing that means a bit more humidity or a bit less, that's what gives in the equation, though I do my best to keep the VPD averaging around 1 if I can.