Personally, I love my fan speed controller. I keep it on it's lowest setting almost all the time to minimize the noise. That said, my fan is 171cfm and my tent is less than 40cu ft.
To note, a long and winding vent hose decreases the efficiency of a fan. Mine vents directly out of the top of the tent with the filter just inside - no vent hose used. Also, fans work more efficiently when they pull vs. pushing air. Just a few things to think about.
To note, a long and winding vent hose decreases the efficiency of a fan. Mine vents directly out of the top of the tent with the filter just inside - no vent hose used. Also, fans work more efficiently when they pull vs. pushing air. Just a few things to think about.