Dell 3000CN - Manual (Page 17)

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Loading Envelopes
To load envelopes that are under 8.66 inches (220 mm) in width in the multipurpose feeder, insert
the envelopes with the flaps open and toward the front of the printer, with the recommended print
side face up. To load envelopes that are over 8.66 inches (220 mm) in width in the multipurpose
feeder, insert the envelopes with the flaps closed and the short-edge of the envelopes facing into
the printer, with the recommended print side face up. You can load envelopes up to the maximum
fill line in the tray at one time.
NOTE: Make sure set the envelope flaps are completely unfolded.
NOTICE: Never use envelopes with windows, coated linings, or self-stick adhesives. These lead to
paper jams and damage to the printer.