HP 2605dtn - Manual (Page 61)

4. Slide the media-width guides slightly wider than the print media.
NOTE Load 10 envelopes or less into Tray 2 with the flaps on the right side, the side to
be printed facing up, and with the short edge leading into the printer. If the envelope has
a flap on a short edge, this edge must enter the printer first.
ENWW Loading trays 49