Brother Copier/Printer MFC-9970CDW - Manual (Page 197)

Specifications
181
D
1 For labels, we recommend removing printed pages from the output paper tray immediately after they exit the machine
to avoid the possibility of smudging.
Duplex
Printing  Manual Duplex: Yes
 Automatic Duplex: Yes
 Paper Size
(Automatic Duplex): Letter, Legal and Folio
 Paper Weight
(Automatic Duplex):
16 to 28 lb (60 to 105 g/m
2
)
 Paper Type
(Automatic Duplex): Plain Paper, Thin Paper, Recycled Paper
or Glossy Paper