Preparing The Envelopes - Canon Color ImageRunner C3380 Reference Manual

Preparing the Envelopes

This section explains how to prepare the envelopes before loading them into the
paper drawer.
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Envelope Feeder Attachment-C2 (Optional)
Take five envelopes, loosen them as shown, and then stack
them together.
Repeat this step five times for each set of five envelopes.
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.