HP LaserJet Pro 400 Printer M401 series - Manual (Page 25)

Table 2-1 Supported paper and print media sizes (continued)
Size and dimensions Tray 1 Tray 2 Optional 500-
sheet Tray 3 Duplexer (duplex
models only)
Envelope Commercial #10
105 x 241 mm (4.13 x 9.49 in)
Envelope B5 ISO
176 x 250 mm (6.7 x 9.8 in)
Envelope C5 ISO
162 x 229 mm (6.93 x 9.84 in)
Envelope DL ISO
110 x 220 mm (4.33 x 8.66 in)
Envelope Monarch
98 x 191 mm (3.9 x 7.5 in)
Custom
76 x 127 mm to 216 x 356 mm
(3.0 x 5.0 in to 8.5 x 14 in)
ENWW Supported paper sizes 13