where can i find literature on fabricating ductwork by hand?

Question

looking for information on how to fabricate :square to rounds,drop cheek elbows,offsetting transitons,etc...........

Answer 1

Try the Sheetmetal Contractors Association its somthing like SMACA .

Fabrication is not the hard part. Laying out the various fittings may be more than you want to do.

There are software packages available that will do the layout work for you but all I've seen are pretty expensive.