Outdoor air ventilation is required in building codes and standards to dilute indoor concentrations of indoor-generated pollutants. Lower outdoor air ventilation rates are associated with decreases in satisfaction with indoor air quality (IAQ) and increases in building-related health symptoms in office workers. Reductions in office and schoolwork performance and increased absence rates have also been demonstrated at lower ventilation rates. Despite the evidence of the importance of ventilation,
commercial buildings often have the outdoor damper closed, eliminating any intentional ventilation of the building.

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