yeah, set all fans as said above.
Also If yo*r *abby has provision to fix a top fan set it to exha*st
and if yo* have a very large side fan say 200*m than set it to s**k *ool air inside
and set all fans to exha*st in*l*ding front fan.
I've read that on some iss*e of digit - jan 2007 may be.