Canon BJC-4400 Series User Manual page 41

Make sure the
paper support
is raised, and the
paper output tray
is extended.
Prepare the
envelopes.
Chapter 3
Arrange the stack of envelopes on a firm surface and press
down firmly on the edges to make the folds crisp.
Press all the way around the envelopes to remove any
curls and expel air from inside the envelopes.
Make sure any curls are removed from the flap of each
envelope.
PRESS DOWN FIRMLY ON
THE EDGES OF THE FLAP
Paper Handling 3-15