HP LaserJet 4000 Printer series - Manual (Page 42)

EN
Chapter 2: Printing Tasks 31
Printing Both Sides of Paper
(Optional Duplexer)
The printer can automatically print on both sides of paper with an
optional duplex printing accessory (duplexer). This is called
duplexing.
Note See the documentation included with the duplexer for complete
installation and setup instructions. Duplexing might require
additional memory (page C-1).
The duplexer supports sizes from B5 JIS (7.2 by 10 inches or 182 by
257 mm) to legal (8.5 by 14 inches or 216 by 356 mm).
Figure 7 Printer with the Optional Duplexer
Installed Removed