Canon imagePRESS C800 Series Troubleshooting Manual page 95

Chapter 1
2) Hold down the four corners of the envelopes firmly, so that they and the sealed or glued portion stay flat.
[Caution]
- If envelopes that have glue attached to their flaps are used, the glue may melt due to the heat and pressure of the fixing unit.
- Take particular care to spread the envelopes out in the direction that they will be fed.
- 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 Envelope Feeder Attachment-F1.
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