Canon Color imageCLASS MF8450c Basic Operation Manual page 145

Selecting Paper Source
4
Load envelopes into the stack bypass.
For details, see "In the Stack Bypass Tray, " on p. 2-
15.
5
Use [▼], [▲] or
the desired size of envelopes, then press
[OK].
You can select from the following sizes of
envelopes:
<COM10>, <Monarch>, <DL>, <ISO-C5>, <ISO-
B5>
For details, see "Paper Requirements, " on p. 2-7.
6
Press [OK] to select <Stack Bypass Tray>.
4-16
(Scroll Wheel) to select
7
Press (Start).
8
Press (Main Menu) to return to the
Main Menu screen.