Canon Color imageCLASS MF9220Cdn Basic Operation Manual page 72

■ If you are loading envelopes into the stack
bypass tray:
① Take five envelopes, loosen them as shown,
and then stack them together.
Repeat this step five times for each set of
five envelopes.
② Place the envelopes on a clean, level
surface, and press all the way around the
envelopes by hand, in the direction of the
arrows, to remove any curls. Repeat this
step five times for each set of five
envelopes.
Take particular care to spread the envelopes out
in the direction that they will be fed.
③ Hold down the four corners of the
envelopes firmly, so that they and the
sealed or glued portion stay flat.
– Do not print on the back side of the envelopes
(the side with the flap).
– If the envelopes become filled with air, flatten
them by hand before loading them into the
stack bypass tray.
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