Hi all, i already have my 6" ac infinity sucking air out of my tent into my attic. I am going to be connecting it to my bathroom veny decting to get it up out through the roof. It is a pretty long run, and i dont want to turn my 6" fan any higher due to noise. I also have a 4" ac infinity sitting around. Can i add the 4" to the same line to help get air out? Or bad idea? Thanks.