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Major Impurities in Indoor Air:
Volatile Organic Compound
In Indoor environment Toxic Gases are emitted from wide
variety of sources:
▪ Building Materials,
▪ Cleaners, Plastics,
▪ Wood Products,
▪ Paints, Carpets,
▪ Polishers, Deodorants, etc… know as Volatile Organic
Compound (VOC)
It adversely affect to:
▪ Allergy,
▪ Asthma,
▪ Eye & Nasal irritation,
▪ Affect respiratory tracts….
Carbon –di-oxide (CO2)
Indoor environment human being Exhale Carbon–di-oxide.
It cannot be reduced or oxidized.
It is not a toxic or carcinogen but a high level of CO2,
causes:
▪ Headaches, Restlessness,
▪ Difficulty Breathing, Sweating,
▪ Tiredness, Increased Heart Rate,
▪ Elevated Blood Pressure,etc…
Hence, Oxygen is used to reduce the carbon – di – oxide
level.
Odor
Odor is a major Irritants & it is cause from various
sources:
▪ Food Odor
▪ Body Odor
▪ Mold, Fungi & Microbes
▪ Cleaning Chemical Odor, etc
This is a residual odor & difficult to dilute from
conventional method. These are collectively known as
“SICK BUILDING SYNDROME”
To address Sick Building Syndrome (SBS), the HVAC System
takes “Fresh Air” to dilute Volatile Organic Compound
(VOC), Odor and reduce Carbon dioxide (CO2) within
acceptable limits.
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How to reduce “Fresh Air” in the process of achieving Indoor Air Quality:
▪ By using controlled injection of ozone.
▪ Oxidation of VOC is performed by ozone and not by oxygen of the fresh air.
▪ Ozone is more powerful oxidizing agent than oxygen.
▪ In the presence of a more powerful oxidant, less powerful oxidant does not have the chance to perform oxidation, until no more of the former is available.
▪ Oxygen of the fresh air is preserved and not spent in performing the task of oxidizing the VOC, which is now transferred to ozone.
▪ Available oxygen is now used entirely to maintain CO2.
▪ Intake of fresh air is reduced drastically. Thus fresh air requirement goes down to 5CFM or less per person.
ASHRAE Standards for Indoor Air Quality
▪ ASHRAE Ventilation code no. 62-1999.
▪ Minimum 15 CFM per person fresh air is required.
▪ Minimum of 30 CFM fresh air is required if smoking is permitted.
Ozone Generator Technology to improve Indoor Air Quality – Green Building Solutions
▪ Ozone is tri atomic Oxygen.
▪ O3 is a very strong disinfectant & oxidant. Any pathogen or contaminant that can be disinfected altered or removed via an oxidation process, will be affected by ozone.
▪ It is the strongest of all molecules available for disinfection.
Approved Safe Ozone levels Standard: (Indoor Air Quality)
Maximum Permissible Concentration in Occupied space:
ASHRAE: 0.05PPM (50PPB)
OSHA : 0.1 PPM (100PPB)
Exposure of 8hrs/day, 5 days a week
FDA : 0.05 PPM (50PPB)
Continuous exposure 24hrs/day 365 days a year if Ozone concentration exceeds, it becomes a toxic gas.
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Improve Indoor Air Quality - Solutions | Green Building - Solutions 
