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INDOOR AIR QUALITY

INDOOR AIR QUALITY. FINDING THE PROBLEM. DEFINITIONS. ACCEPTABLE INDOOR AIR QUALITY Air in which there are no known contaminants at harmful concentrations as determined by cognizant authorities.

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INDOOR AIR QUALITY

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  1. INDOOR AIR QUALITY FINDING THE PROBLEM

  2. DEFINITIONS • ACCEPTABLE INDOOR AIR QUALITY • Air in which there are no known contaminants at harmful concentrations as determined by cognizant authorities. • A substantial majority (80% or more) of the people exposed are not expressing dissatisfaction with air quality • Source: ASHRAE standard 1990, 62-1989

  3. DEFINITIONS • SICK BUILDING SYNDROME (SBS) • A building that has a large number of complaints derived from occupants. • Complaints may not be clinically diagnosed or medically verified • BUILDING RELATED ILLNESS (BRI) • When the illness is diagnosable.

  4. IAQ FACTORS • Physical • Psychological

  5. Headache Fatigue Shortness of breath Sinus congestion Cough Sneezing Skin irritation Dizziness Nausea Eye, nose, throat irritation COMMON SYMPTOMS

  6. THE PROBLEM • NIOSH studies have shown that over 50% of the complaints in a building are in some way related to the heating, ventilating and air conditioning system (HVAC)

  7. ENVIRONMENTAL VARIABLES • Air temperature • Mean radiant temperature • Relative air velocity • Ambient water vapor pressure (relative humidity)

  8. PERSONAL VARIABLES • Activity Level • Clothing Level Source: ASHRAE Fundamentals Handbook 1993

  9. ENVIRONMENTAL COMPLAINTS • Too hot • Too cold • Too humid • Too dry • Poor ventilation • Mold • Dust

  10. FINDING THE PROBLEM

  11. GO LOOK INVESTIGATE

  12. THE HVAC SYSTEM • Outside air intake • Filter sections • Coils and drain pans • Fans • Supply duct • Return path/duct

  13. MAINTENANCE • Watch for water accumulation • 50% of the IAQ problems are microbiological • Air quality tests seldom, if ever, identify a specific problem

  14. MAINTENANCE • Custodial • Condensate/P-Traps

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