Brother HL-3450CN Series User Manual page 70

CHAPTER 3 BEFORE WORKING WITH THE PRINTER
Before loading envelopes in the cassette, check the following:
•
Envelopes should have a lengthwise sealing flap.
•
The sealing flaps should be folded crisply and correctly (irregularly cut
or folded envelopes may cause paper jams).
•
Envelopes should consist of two layers of paper in the following
marked area.
•
Envelope joints that are sealed by the manufacturer should be secure.
•
All sides should be properly folded without any wrinkles or creases.
•
Print quality may vary between different style envelopes. It is a good
idea to test the envelopes you wish to use prior to purchasing large
quantities.
Fig. 3-6
3-14