Kyocera FS-1128MFP Operation Manual page 73

Preparation before Use
IMPORTANT: How to load envelopes (orientation and
facing) will differ depending on the type of envelope. Be
sure to load it in correctly, otherwise printing may be
2
done in the wrong direction or on the wrong face.
NOTE:
When you load envelopes in the multi purpose
tray, select the envelope type by referring to Specifying
Paper Size and Media Type for the Multi Purpose
Tray on page 2-41.
OPERATION GUIDE 2-37