I use this fan to vent smoke from two laser cutters through a 40 foot long horizontal air duct out of the back of our shop. It does a really good job! It pulls the smoke out of the lasers very quickly, and there's no smoke smell, even when I open the door immediately after cutting.My only complaint is that they literally used nothing but twist caps to connect the fan to the main power cord internally. Needless to say, it's fragile. One gentle tug ripped all but 1 wire out of their caps. I had to disassemble the fan and solder it back together. So I give them a 1 star for durability. But aside from that, the fan is amazing.