Canon G4000 series Online Manual page 37

3. Slide the paper guides (E) to open them, and load the envelopes in the center of the rear tray
WITH THE ADDRESS SIDE FACING UP.
The folded flap of the envelope will be faced down on the left side.
Up to 10 envelopes can be loaded at a time.
4. Slide the paper guides (E) to align them with both sides of envelopes.
Do not slide the paper guides too hard against the envelopes. The envelopes may not be fed properly.
Note
• Do not load envelopes higher than the load limit mark (F).
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