The interleave process during duplexing is slightly different, depending on the size of the paper as described below.
Paper Length (mm)  | Interleaved Sheets  | 
|---|---|
Longer than 139.7 (HLT LEF), shorter than 216 (LT LEF)  | 5  | 
Longer than 216 (LT LEF), shorter than 297 (A4 SEF)  | 4  | 
Longer than 297 (A4 SEF), shorter than 364 (B4 SEF)  | 3  | 
Longer than 364 (B4 SEF), shorter than 432 (DLT SEF)  | |
Longer than 432 (DLT SEF), shorter than 457.2 (12"x18")  | |
Longer than 457.2 (12×18in), shorter than 487.7 (13"x19.2")  | 
Five Interleave Sheet Flow
In this example, the flow follows this sequence: 1st front side > 2nd front side > 3rd front side > 4th front side > 5th front side > 6th back side > 2nd back side > 7th front side > 3rd back side > 8th front side > 4th back side > 9th front side, and so on. Refer to the illustration below.