HP Color LaserJet CM4730 Multifunction Printer series - Manual (Page 106)

Size Dimensions Tray 1, mailbox,
stacker Trays 2, 3, 4 Stapler
Post Card 100 x 148 mm (3.94 x 5.83 in.)
Double Post
Card 148 x 200 mm (5.83 x 7.87 in.)
Postcard (US) 88.9 x 139.7 mm (3.5 x 5.5 in.)
Postcard
(European) 105 x 148 mm (4.13 x 5.83 in.)
Table 7-2 Supported envelopes and postcards (continued)
90 Chapter 7 Paper and print media ENWW