Sheetmetal Duct Support

Is there a “proper” way to support sheetmetal ductwork in a basement? I came across this today and it just doesn’t seem right. I’ve looked in my code check book but don’t see anything regarding support. Any info would be appreciated. Thanks!

Basement ducts are incorrectly supported need to be repaired Immediately by a qualified Person .

Ok, I can go with that. Thanks Roy!

Out of general knowledge; how are they supposed to be supported?

Usually with a Piece of flat stock 1 Inch usually with Top screwed to the rafters and bottom bent I inch under the duct with a couple of screws side and bottom .

Outstanding. Thanks a bunch!