Home About Us Products Office Supplies Customer Support Contact Us Login Glossary - A - ADU ADU Abbreviation for Automatic Duplex Unit; this copier/mfp accessory is necessary for producing quick two-sided or double-sided copies/prints.  After the copier/mfp prints the content on the first side of a two-sided document, the duplex unit turns the paper over and sends it back into the printing path to receive the second side. < Back to Glossary Index

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