Hi Rachel,  Obviously from the responses youÕve received there could be several possibilities.  Dry traps are usually a good one to start with.  If you (and your facilities and research staff) have exhausted all possibilities there is also something called "dirty sock syndrome".  Google it and you will see many reference and discussions.  Here is a link with an explanation.

 

http://www.foxservice.com/austin/knowledge_base.asp?ID=1291219433792&_perPg=40&view=articles&_category=Residential%3A%3AAir%20Conditioning%20%26%20Heating%20&_filterField=Categories

 

We recently had an issue that people described as dirty socks, sewer gas, etc. After several months found the odor by reviewing the floor plan of the building and following the pipes in the walls.  We found a couple of uncapped pipes that were no longer in use.

 

Good luck,

 

Patty

 

 

Patty Olinger, RBP

Director EHSO

Emory University

1762 Clifton Rd., Suite 1200

M.S. 0940-001-1AB

Atlanta, GA 30322

404-727-5690 office

404-727-9778 fax

www.ehso.emory.edu

 

 

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