Enough room for hanging duct work
I currently have concrete block walls high enough that when the concrete floor pad is poured and that when the trusses were set on the block walls then I would have 8 foot high interior walls/ceiling. I was thinking about hanging the air exchanger(?) and duct work under the trusses. If I went up just one more concrete block high then would that be enough room to hang duct work ? Its ok if I dont have exactly 8 foot high ceiling. How thick is duct work ? I thought about putting in a drop ceiling just below the duct work. I heard that this is more efficient than putting the duct work in the attic.
Any thoughts or suggestions ?