To copy onto custom size envelopes, you must specify the envelope's dimensions. Specify the horizontal and vertical length of the envelope.
A: Horizontal
B: Vertical
Load the envelopes face up in the bypass tray.
The bypass tray () is automatically selected.
Press [].
Press [Paper Size].
Specify the envelope size, and then press [OK] twice.
Place the originals, and then press [Start].
For details about using envelopes, see Copying onto Envelopes.