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Perceptions of indoor air quality associated with ventilation system types in elementary schools
M R Kinshella1, M V Van Dyke, K E Douglas
1Tri-County Health Department, Englewood, Colorado, USA.
Applied Occupational and Environmental Hygiene
|October 16, 2001
Summary
School ventilation systems impact indoor air quality. Unit ventilator (UV) systems showed higher particle levels and more occupant complaints, while variable air volume (VAV) systems were linked to fewer eye irritations.
Area of Science:
- Environmental Health
- Building Science
- Occupational Health
Background:
- Year-round school utilization raises concerns about indoor air quality (IAQ).
- Ventilation system type is a potential factor influencing IAQ and occupant health.
- Understanding these associations is crucial for improving school environments.
Purpose of the Study:
- To investigate the relationship between different ventilation system types and perceived indoor air quality.
- To assess objective IAQ parameters (CO2, air exchange rates, particle counts) in relation to ventilation systems.
- To correlate IAQ measurements with occupant-reported symptoms.
Main Methods:
- A survey of 403 school staff across 12 schools.
- Measurement of carbon dioxide (CO2) levels, air exchange rates (ACH), and particle counts.
- Calculation of indoor-to-outdoor particle ratios for various size ranges.
Main Results:
- Unit ventilator (UV) systems had the lowest CO2 (637 ppm) and ACH (2.67), but higher particle ratios, especially for particles >3 microm (3.20-14.76).
- Variable air volume (VAV) systems showed a lower prevalence of red/watery eyes compared to other systems.
- UV systems were associated with increased nasal congestion, sore throat, headache, and dustiness complaints, potentially due to higher particulate levels.
Conclusions:
- Ventilation system type significantly influences school indoor air quality and occupant health perceptions.
- VAV systems may offer better outcomes regarding eye irritation.
- UV systems require further investigation due to associations with increased respiratory and sensory complaints, likely linked to elevated particle concentrations.