The noise from my computer fans isn't a prob but, if I could find a way to muffle the exhaust/scrubber fan, that'd be nice.
Anyway, I used a carving knife to rip the foam rubber strips to 1" x 2", then attached them on their sides to the foam board so it stands 2" from the side of the cab. Also, the latex caulking worked well to secure the strips to the foam board (because they had time to set up) but, I used double-sided carpet tape to stick the whole works to the cab. Mofos are on there good now!
Thanks again for the idea 7th1der.