New LEED Certified Building with a bad odor

[Lunda Center Conference Center]

New poster....

I am director of a new (8 months old) LEED certified conference center
in the midwest. Whenever my outdoor air dampers open between 75-100%
AND the outdoor humidity is high AND outdoor air temp is low - I get a
bad odor in the facility. It's almost like clockwork, but all 3
things have to be happening at once. The smell has been described by
others as chemical while others have said moisture related.

Common issues:
- Air handlers wide open
- High humidity
- Temp in the 30's - 40's

We've had a company take air samples and a nine page report and I
can't figure out what it means. Here is the beginning of the report
talking about silicone in the air sample.

I'm pulling my hair out on this - if anyone as any thought - I would
love to hear them.

MSDS No.: 02272997 Revision Date: 2001/11/13
Generic Description: Silicone
Physical Form: Liquid
Color: Colorless
Odor: Odorless
NFPA Profile: Health 0 Flammability 2 Instability/Reactivity 0
Note: NFPA = National Fire Protection Association
2. OSHA HAZARDOUS COMPONENTS
CAS Number Wt % Component Name
556-67-2 > 60.0 Octamethylcyclotetrasiloxane
541-02-6 3.0 - 7.0 Decamethylcyclopentasiloxane
541-05-9 <1.0 Hexamethyl cyclotrisiloxane
The above components are hazardous as defined in 29 CFR 1910.1200.

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