Your specs on the booth should tell you what the recommended venting is. 4", 5" or 6" most likely.
If not, let me know what CFM the fan is rated for and I'll give you the proper size hard pipe or flex pipe. Then you just need to buy the proper vent hood for the outside (like a dryer vent hood) and you're in!
I'll try and look up your booth after my due-dilligence here at FSM