Ryan, Tin knocker question!

Ryan, Thanks for your generous offer but I've got it all layed out with the exception of the allowance for the bead. I'm going to make a cardboard template before I start cutting any sheet metal just to make sure I didn't make any mistakes on the drawing board. (It must be nice for the shops that had a CAD program for this!) I'll make the collar first just to get the feel of running the bead again. The transition bead I know is tougher due to the angles that intersect the bead. I kept the length relatively long for good air flow plus it's easier to make with the shallower angles. OK, 1/2" for the bead! Thanks again

remeber to put the pipe into the bead machine and tighten until its snug, then tighten one turn..start then make small incriments so it doesnt distort..if you tighten too much it will cut through your metal

Peter I wish I could tell you how much you need.I apologise for not knowing,most of my HVAC that I do I don't get into the tin bending end of it.I just measure it up and have a shop do it.Its my experience that tin bending is an art and if you don't do it all the time you never really get good at it.

Peter,if you want to you can go to any sheet metal shop and ask them to custom make the piece.Just as long as you give them the exact measurements that you need.It will say you time and hassle in the end.Most shops can make that in a day.