*RICSP-3600DN: A maximum of One (1) Optional Paper Feed Units may be added for a maximum paper capacity of 850 sheets including the standard Paper tray and Bypass Tray. Supports paper sizes up to 8.5" x 14" and paper weights up to 43 lb Bond/90 lb Index. 500-Sheet Paper Feed Unit

*RICSP-4510DN: A maximum of Two (2) Optional Paper Feed Units may be added for a maximum paper capacity of 1,600 sheets including the standard Paper tray and Bypass Tray. Supports paper sizes up to 8.5" x 14" and paper weights up to 43 lb Bond/90 lb Index. 500-sheet Paper Feed Unit

*RICSP-4520DN: A maximum of Two (2) Optional Paper Feed Units may be added for a maximum paper capacity of 1,600 sheets including the standard Paper tray and Bypass Tray. Supports paper sizes up to 8.5" x 14" and paper weights up to 43 lb Bond/90 lb Index. 500-sheet Paper Feed Unit