Large commercial buildings are often subject to poor air quality as a result of improper construction or a disruption caused by the people that use the building. This video details one investigation of a cold-climate North American office building. These guys were engaged when some tenants of an office space complained about the air quality. As it turns out, most of the return air was not actually being pumped outside, and one vent was completely blocked off.

Investitation by the Building Science Corp.

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