I just put in a big carbon filter with a 6" fan. Got it set up venting under building with passive intake hole but since I have had it on and venting out the smell is now obvious outside of the building? WTF??! Was no smell before and wanted to get some fresh air to the plants so what do I do now?? How could this be??? The Vent lines are all done right so I am at a loss... Thanks for any help...