Those 6"dia. galvanized vent pipes are $8.20 for a 5' length and a couple
of SS clamps are $1.98 ea.

I tried those HD galvy vent pipes to extend the chimney, to see how tall
it needed to be to release the smoke above ground turbulence. They didn't
last one winter.


At least you were able to do a cheap test before figuring out what size to
get of the expensive stuff.

http://www.homedepot.com/h_d1/N-5yc1...1#.UNnbYayLOuI

It's definitely not designed for a wood stove.