Oki MC853 User Manual page 865

Com-10, DL, C5
Memo
If you are using envelopes with the flap (for gluing) on the long edge (Com-10, DL, C5),
load them with the flap folded so that the flap is on the left side when fed.
7.
Close the document set cover.
8.
Open the rear output tray.
C4
864