Canon iR3245 Troubleshooting Manual page 77

2
Grip the handle, and pull out the paper drawer until it stops.
3
Load 10 envelopes at a time with the side you want to print on face up.
While loading the envelopes, press down on the right side of the receptacle
to lock them into place.
Load the envelopes, as shown below.
Front
Envelope Feeder Attachment-C2 (Optional)
Claw
2-19
2