Fan was replaced on 02/10/13, see Laser Cutter Exhaust Blower Fan for more info.
There is an arrow on the back of the blower case, it shows what direction the motor should be turning, it is now set so FORWARD rotates it in the right direction.
If you disconnect the hoses, please note the words cast into the case where the hoses connect: IN OUT
IN is the sucky part - connect this to the laser cutters
OUT is the blowy bit - it connects to the pipe to somewhere else