I have an intermittent dead animal smell that permeates my master closets downstairs and sometimes my daughter's closet upstairs. Both areas have attic directly above them. We have had pest control confirm that there is no rodent activity, plumbers that say there is no plumbing back up in pipes, AC people that say there is no AC problems. Can this have anything to do with venting pipes in attic. Strange thing is that when the smell is in the closet it is not in the attic? Any ideas?