HP LaserJet M4349 Multifunction Printer series - Manual (Page 201)

Clear jams from the optional envelope-feeder area
This section applies only to jams that occur when you are using an optional envelope feeder.
1. Remove any envelopes that are loaded in the envelope feeder. Lower the envelope weight and lift
the tray extension up, to the closed position.
2. Press and hold the release button on the left side of the optional envelope feeder. Grasp both sides
of the optional envelope feeder and carefully pull it out of the device.
3. Slowly remove any jammed envelopes from the optional envelope feeder and from the device.
ENWW Clear jams 187