Document.PrintPagesDown Property (Visio)
Gets or sets the number of sheets of paper on which a drawing is printed vertically. Read/write.
You must set the value of the PrintFitOnPages property to True to use the PrintPagesDown property. If the value of the PrintFitOnPages property is False, Microsoft Visio ignores the PrintPagesDown property.
The PrintPagesDown property corresponds to the Fit by sheet(s) down setting in the Page Setup dialog box (on the Design tab, click the arrow in the Page Setup group).