What's Your IAQ/IEQ?

dedicated outdoor air sytems......environment conservetionist ...please step in.. stop pollution plant more trees

I keep my office well ventilated opening all windows open and let polluted air enter our premises and choke us with CO2 ,seriously to control humidity we use airconditioning

I'm all for reducing outdoor air quantities to reduce the energy and environmental costs of conditioning all of that air. However, I think CO2 sampling is only appropriate for large spaces, but overkill and expensive for many other common use types. For a suite of offices, I think code should allow airflow to be controlled by temperature only - if occupants are present, they will generate a load, and ventilation rate will increase. During unoccupied periods, I'd let airflows drop to a very low minimum, say the code rate for corridors or storage space. As to outdoor air fraction, I'd control it at the air handler based on a diversified block load. No one can convince me that O2, CO2, other contaminants wouldn't diffuse throughout a building, the same way water vapor and humidity does. The requirements to analyze required outdoor air fraction to a mixture of spaces; and to analyze ventilation effectiveness of air outlet devices in a room are, to me, compulsive overreactions to the fear of predatory lawsuits.