Dell W5300 Workgroup Laser Printer - Manual (Page 62)

Gently adjust the envelope support for the size you are loading:
Fully closed (pushed in toward the printer) for short envelopes
Extended to the middle position for medium-length envelopes
Fully open (extended to its full length) for long envelopes
1.
NOTICE: Do not place objects on the envelope feeder. Avoid pressing down on it or applying
excessive force.
Lift the envelope weight back toward the printer. It stays in place. 2.
Slide the width guide to the far right. 3.