my current hydrofarm 454 cfm fan is pretty damn loud.its the only thing that gives away my hidden room that i spent a ton of money trying to make incognito. one thing i have done before and will be doing again for my big fan is building a box around it from fiber board and just set the fan in there,it works pretty well,this time around i was just anxious to try out the new setup.and its fine how it is,but im trying to vent my lights out side like Rezinator sed"hence such a long run of ducting...ill keep searching thanks guys.