Canon MF7280 - ImageCLASS B/W Laser Driver Manual page 136

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Printing on Custom Paper
In the printer properties dialog box, click the [Page Setup] tab
➞ click [Custom Paper Size].
Enter a custom paper name in [Name of Custom Paper Size].
Select the unit of measurement to specify the paper size for
[Unit] ➞ specify the height and width for [Height] and [Width].
NOTE
Enter the values for the height and width of the paper size in portrait orientation,
where the height should be longer than the width.