Canon imageCLASS MF5730 Basic Manual page 40

2
Insert the envelope square into the multi-purpose feeder with the
print side up and the right edge (i.e., closer to the stamp) first.
3
Specify the size and the type of the paper you load.
For details on how to specify the paper size and type, see "Specifying the Paper Size
and Type (Common for Cassette and Multi-Purpose Feeder)," on p. 2-10.
Loading Paper 2-9
2