Canon Laser Shot LBP-1110 User Manual page 36

2. Adjust the paper guides to the width of the stack of envelopes.
Most applications allow you to choose which way envelopes feed into the
printer. Make sure your printer settings before you print.
When using C5-size envelopes, remove any stiffness by lightly flexing
both edges of the envelope.
21
Chapter 2 Paper Handling