The Tennsmith sheet metal break can handle 12-gauge and lighter materials.
It can be used for box and pan and straight bending in hot rolled and cold rolled plate, stainless steel, aluminum, and heavy plastic. When using aluminum sheets, the 5000 series aluminum sheets work very well with this machine.
This can handle a sheet of up to 48″ width.
This is a nice YouTube video to show how a nice duct can be made:
