For it's size it a monster. I had a water leak. This was for the crawlspace under the house. I hoped to move a lot of air. The duct directed the air where I want. But you need everything secure because the airflow is wild. Secure the duct. It can expand and move wildly with the air. This moves a lot of air. You could ventilate an entire tunnel under a border with one or two of these. It's small but heavy. Everything is thick, sturdy, and simple. I bought this in an emergency to move a lot of air. Hopefully that will be fixed and I'll find some other purpose for this since it works so well. Not sure what since it has only one speed, fast. Too much to stand in front of, and consider small animals that walk behind it.