Sheet metal question

[dchvac]

New to sheet metal here....Say you wanted to order rectangular sheet metal with all four sides overlapping...would you ask for "S" or "Drive" seams?

[key]

I'm assuming your talking about rectangular fitting...so I would say "S"

[secorp]

If you want four piece ductwork, that's what you ask for. just decide if you want pittsburg seams of snap lock seams. the but end of the ductwork is S and Drive, or raw all S, or duct mate, or TDF.

[Diceman]

Not sure what you are asking.
S or Pittsburgh seams are sealed tighter, but you need drives to put the thing together at some point.

[hvacpope]

New to sheet metal here....Say you wanted to order rectangular sheet metal with all four sides overlapping...would you ask for "S" or "Drive" seams?

S or Drive seams are use mostly in residential jobs, you could either use drives or s-clit for the end joints and S or Pittsburgh for the sides, with a Pittsburgh joint depending on the duct size you could make the fitting out of a single piece of sheet metal, S joints requires 2 or more pieces. Commercial ductwork uses Pittsburgh locks for the seams and duct mater for the joints.