Brother HL-1660E - Manual (Page 63)

CHAPTER 3 BEFORE WORKING WITH THE PRINTER
3–13
Using Envelopes
Avoid using envelopes with the following characteristics:
• Smooth or shiny surfaces
• Protection cover at envelopes’ adhesive parts
• Sealing flaps that have not been folded at purchase
• Sealing flaps as shown below
• Three or more layers of paper in the marked area
• Each side folded as shown below
Fig. 3-3 Envelope Information