Prevent indoor air quality issues through the provision of adequate ventilation.
Poorly ventilated spaces contribute to symptoms — such as headache, fatigue, dizziness, nausea, cough, sneezing, shortness of breath and eye, nose, throat and skin irritation — collectively called sick building syndrome (SBS). The economic costs of SBS in under-ventilated buildings are significant and far exceed the energy-related cost savings. Poor ventilation is also linked to increased rates of absences, higher operational costs and decreased productivity. One U.S.-based study reported that the sick leave attributable to insufficient provision of fresh air in buildings is estimated to be 35% of total absenteeism.
To verify compliance with the ventilation rate requirements specified in Part 1: Ensure Adequate Ventilation, the following requirements are met or are scheduled to be met (as applicable):
Newly installed mechanical ventilation system or ventilation system that undergoes significant alterations is tested and balanced in accordance with ASHRAE 111.
Existing mechanical ventilation system is tested and balanced every five years to verify that the minimum ventilation rates (as determined in Part 1: Ensure Adequate Ventilation) are within ± 10% of the minimum design values.
Projects using the elevated air speed method for thermal comfort verify that air speed complies with design specifications.
Note: Reasons for adjustment or modification of the mechanical ventilation system that result in a requirement for system rebalancing include significant building alterations, significant changes in occupant density, changes in building use or occupancy category or other changes inconsistent with system design assumptions.
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