Brother HL-1660E User Manual page 168

USER'S GUIDE
5–12
When the duplex unit is installed, paper handling and capacity of the
upper paper cassette changes as follows:
For Duplex
paper source
all sources for duplex
printing (DX)
The upper paper cassette with duplex installed
paper source available size
the upper cut sheet : letter, legal, A4,
paper cassette
(T1)
envelope : COM 10
available size
cut sheet : letter, legal, A4, ISO
B5(except T2) and Executive
capacity
:250 sheets/27.5mm
ISO B5, Executive :250 sheets/27.5mm
A5 :200 sheets/24.5mm
ISO B6 :140 sheets/17.5mm
A6 : 80 sheets/10.0mm
: 15 sheets/20.5mm
Monarch : 15 sheets/20.5mm
C5 : 15 sheets/20.5mm
DL : 15 sheets/20.5mm
ISO B5 : 15 sheets/20.5mm