Sorry for all of the threads guys, let me know and I will stop
Anyway, Dan Friedrichs posted this link in another thread: http://harderwoods.com/pipe.html
I went and tried it out on some 4" thin wall pipe that I currently use for my collector and was impressed!!
As you know I am looking to upgrade to 6" and I can find thin wall 6" pipe for about $14 for 10 feet, but the total for the fittings I would need would have been over $200.
With this method I will have to spend some time, but no money on fittings. I am planning on using three 30 degree angles instead of two 45's, since I am making them it won't cost more and should be better for air flow.
On the final pieces I will caulk the joints and sand out the inside for the smoothest flow.
What do you think? Do you think the below will work?