I just so happened to have found a 6" Sunleaves Windtunnel at Goodwill today for $3.75!
http://www.sunleaves.com/detail.asp?sku=SW606
This thing is an inline fan. I believe it is designed for grow tents. However, I was thinking I could hook it up to existing duct work. It moves 409 cubic feet per minute, this 120-volt, 70-watt model has an 11” total diameter and 6” opening to accommodate ducting of the same size. You can also get a speed control to turn it down if needed.
I don't know much about air flow or HVAC. Do you think this fan would be
enough to circulate air through a 2000 sqft house or is it too small?
If it doesn't work for the house, I am thinking about an outbuilding. I couldn't pass it up for less than $4.00! I will find some use for it.