80 cfm works very well. The plenum design is teh way it's done.
Sorry I just found this message. First time I got one from a visitor.
Good luck with your spray booth.

Charleston, I noted your spraybooth design posting from January 2006, liked it and am in the process of replicating it. How well does the 80 CFM fan work for you? Also where did you get the idea for the 4" plenum space? Do you think the system would work without the plenum? Thanks for any info. John