3-14 Paper Handling Chapter 3Printing on EnvelopesYou can stack up to 15 envelopes in the sheet feeder or you can manuallyfeed envelopes one at a time.U.S. Commercial number 10 (COM10) envelopes and European DLenvelopes are recommended. You may be able to stack envelopes ofother sizes in the sheet feeder; however, Canon cannot guaranteeconsistent performance on envelope sizes other than COM10 and DL.The following envelopes are not recommended because they may causejams or smears, or may damage your printer.m Envelopes with windows, holes, perforations, cutouts, anddouble flaps.m Envelopes made with special coated paper or deeplyembossed paper.m Envelopes using peel-off sealing strips.m Envelopes in which letters have been enclosed.When you are ready to print on envelopes, follow these steps to stackenvelopes in the sheet feeder. (You can also manually feed envelopes oneat a time.)m Make sure that the paper thickness lever is set to theright (A).Set the paperthickness lever.