Welcome to the forums drafterjohn! Where might you be posting from?
10" x 14" rectangle x 6" high?
10"Ø x 14"Ø x 6" high?
Need to know more.
I started working in sheetmetal, duct work, over 40 years ago.
A worthwhile and satisfying trade.
All kinds of worthwhile reference material available at The Sheetmetal Shop.