HP LaserJet P2015 - Manual (Page 37)

Print on special media
The following sections explain how to print on a variety of media.
Print on an envelope
Only use envelopes that are recommended for laser printers. See Guidelines for using media for more
information.
1. Open the straight-through output door.
2. Open tray 1 and adjust the media guides to the width of the envelope.
ENWW Print on special media 27