Loading envelopes short edge first at the center with the flap facing down, and slide the edge guides to the edges of the envelopes.
Fan and align the edges of the envelopes before loading. When the stacked envelopes are puffed up with air, press them down to flatten them before loading.
Do not use envelopes that are curled or folded. Using these envelopes causes paper jams and smears on the printout.
Do not use envelopes with adhesive surfaces on the flaps or window envelopes.
Avoid using envelopes that are too thin, as they may curl during printing.