Apple Mac 8600 - Manual (Page 112)

Take Apart Fan Assembly - 14
fan in one of these units, you
must order a baffle and
install it before replacing
the fan. (Note: all WS 9650
units will come with the
baffle already installed.)
Once the baffle is in place,
the fan must be installed in
the opposite direction, as
shown here; that is, with the
fan label facing in toward
the sheet metal on the side
access panel.