Paper recommendations > 13FACE UP STACKERThe face up stacker at the rear of the printer should be opened and the tray extensionpulled out when required for use. In this condition paper will exit via this path, regardlessof driver settings.The face up stacker can hold up to 100 sheets of 80g/m² standard paper, and can handlestocks up to 220g/m².Always use this stacker and the multi purpose feeder for paper stocks heavier than128g/m².D UPLEX UNITThis option provides automatic two-sided printing on the same range of paper sizes astray 2/3 (i.e. all cassette sizes except A6), using paper stocks from 64-105g/m².NOTE:The duplex unit comes as standard with dn & cdtn models.