question on 6" inline fan hook up & CFL's

can a 6" inline fan be put in the attic and then reduced down from 6" to 2" to fit between the walls and 2" into my cab?

i know i can do it but will it work the same since it's been reduced down so much?

flower cab is 2'x1.5'x2' Tall w/ 6 42w cfls, the two pc fans was still WAY to hot (100's).
(trying "dr. greenjeans" from icmag)

also what is the best set up for clones? i was going to run 4 d.l. and 2 w.w. 23W but worried that might be too much.
 
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