Dell 3115cn Color Laser Printer - Manual (Page 184)

150 sheets of the standard paper or 15 mm (0.59 in.) or less in height.
Print Media Dimensions
The multipurpose feeder accepts print media within the following dimensions:
Width - 76.2 mm (3.00 in.) to 220.0 mm (8.66 in.)
Length - 98.4 mm (3.87 in.) to 355.6 mm (14.00 in.)
Loading the Multipurpose Feeder
In addition to plain paper, the multipurpose feeder can use various other sizes and types of print media such
as envelopes, and transparencies.
Gently pull open the multipurpose feeder cover. 1.
Slide the guides to the edge of the tray. The guides should be fully extended. 2.