NOTE: Fan should never operate 24/7.
This fan is a pretty good fan. I liked the way it attached to the poles of my grow tent fairly easily, and stays in place. The airflow output is great. I'm able to position the face of the fan where I need it without much problem. The electric cord is long enough to reach the power outlet outside the tent, which is a huge plus compared to other models. Overall, I think it's a great fan, I don't hear any extra noises yet, after about 3 weeks. Wish it was oscillating, but I would recommend it.