Canon imageCLASS 2200 Reference Manual page 81

Loading envelopes in the stack bypass.
Take five or so envelopes, and loosen them as shown, then stack them together.
Repeat this step 5 times.
1
Place the envelopes on a clean, level surface and spread them out by hand in the
direction of the arrows.
Repeat this step 5 times.
IMPORTANT
•
Take particular care to spread the envelopes out in the direction they will be fed.
Making Prints Using the Stack Bypass 1-49