Ricoh Aficio MP C4500 Facsimile Reference Manual page 48

Transmission
A
Place the original, and then select the scan settings you require.
B
Press [Original Feed Type].
1
C
Specify the original orientation.
Check the orientation of the placed document, and then press [
Make sure that the specified original orientation matches the orientation of
originals loaded in the ADF.
D
Press [2 Sided Original].
38
] or [ ].