Load Paper : Load Envelopes

Load Envelopes
You can print on envelopes in 4 1/8 × 9 1/2 (#10) size.
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Tip:
Press each envelope flat before loading it or load one envelope at a time.
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Note:
Avoid using envelopes that are too thin, because they may curl during printing.
Do not use envelopes that are curled or folded
Before you print, make sure you select Envelope as the paper Type, Envelope #10 as the Size, and Landscape as the orientation. In Mac OS X, select Extension Settings, then Thick paper and envelopes.
See also:
Load Paper in the Photo Tray
Load Paper in the Main Tray
Select Basic Options