Ricoh B889 Manual page 13

When a fan fold is adjusted, the last surface will be shorter
than the others, because the lengths of the others have
been increased.
For example, if fan folding is increased by +0.05 inches for
a job where three folds are done to create four surfaces,
+0.5 will be added to the first 3 surfaces but the last surface
will be 0.15 shorter.
Slide 13
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Important Points - 2/2
13
B889 - Fan Fold Unit