Envelopes
Only use envelopes that are recommended for laser printers. See
Guidelines for using media
for
more information.
NOTE
For the HP LaserJet 3390/3392 all-in-one, you must load envelopes one at a time in
the single-sheet priority input slot (tray 1).
To prevent the envelope from curling as it prints, open the rear output door (HP LaserJet 3390/3392
all-in-one).