Installing duct

[Rick Beko]

I am running 6" spiral duct for my main lines and I believe I am missing something? Is there an adapter or coupling I would need to connect two 6" spiral pipes together? :o

Thanks

[Calvin Crutchfield]

A coupler? That is the obvious answer, though I have only delt with 4" flex hose to date.

[Joe Jensen]

I am running 6" spiral duct for my main lines and I believe I am missing something? Is there an adapter or coupling I would need to connect two 6" spiral pipes together? :o

Thanks

Spiral duct requires a coupler. There are choices. They sell clamps that go on the outside of both pipes, sleeves that go inside, and rings that get welded on the each end and then the rings are bolted together. Check our this website. Beware, not cheap.
External clamps
http://www.airhand.com/product.asp?CategoryID=17&SubCategoryID=0
internal and external couplers.
http://www.airhand.com/product.asp?CategoryID=5&SubCategoryID=0
Rings, may be able to pop rivet them, but I've only seen them welded.
http://www.airhand.com/product.asp?CategoryID=10&SubCategoryID=0