The office staff in a multi-story large office building kept smelling a sewer odor.  After a thorough investigation, an open vent pipe was located in a pipe chase.  Note, the issue is not only the toxic smell but, it is also flammable.  Expect quality!  Call American Plumbing!  #americanplumbingla.com, @americanplumbingla.com, #videopipeinspection, #leakdetection, #plumbingventing