Galvannealed Hollow Metal Doors and Frames
SDI-112 from the Steel Door Institute contains 2 informative pages on Galvanized/Galvannealed on standard steel doors and frames. It Includes a nice chart comparing G60, G40, A60, A40.
Hollow Metal Doors & Frames | Wood Doors | Door Hardware
Galvannealed Hollow Metal Doors and Frames
SDI-112 from the Steel Door Institute contains 2 informative pages on Galvanized/Galvannealed on standard steel doors and frames. It Includes a nice chart comparing G60, G40, A60, A40.