Canon BJC-620 - Manual (Page 44)

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You can stack up to 15 envelopes in the sheet feeder or you can manually feed
envelopes one at a time.
U.S. Commercial number 10 (COM 10) envelopes and European DL envelopes are
recommended. You may be able to stack envelopes of other sizes in the sheet feeder;
however, Canon cannot guarantee consistent performance on envelope sizes other
than COM10 and DL.
The following envelopes are not recommended because they may cause jams or
smears, or may damage your printer.
z Envelopes with windows, holes, perforations, cutouts, and double flaps.
z Envelopes made with special coated paper or deeply embossed paper
z Envelopes using peel-off sealing strips.
z Envelopes in which letters have been enclosed.
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How you create envelopes within your software application depends on the
application. See your application's documentation for details.
If you are using the Microsoft Windows Printing System, change the Paper Size
setting to #10 or DL.
 3DSHU +DQGOLQJ Chapter 3