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Interactive AirTest CO2 Ventilation Calculator
Last Updated: 11/13/2008
Carbon Dioxide CO2 is a great indicator of the number of people in a room and how much ventilation is required to maintain good indoor air quality.  Carbon dioxide (CO2) is one of the most plentiful gases on the planet and is clear byproduct of human activity as we all inhale oxygen and exhale CO2. It has also been recognized as a method to measure and control cfm/person ventilation rates in buildings called CO2 DCV (Demand Controlled Ventilation). The result is that building operators now have a way to measure real time outside air ventilation rate, rather than relying on a arbitrary setting of out door air intake dampers. Demand control Ventilation with CO2, can save energy in buildings in three ways:

1) unnecessary over ventilation resulting from improper setting of outside air is eliminated,
2) Ventilation can be modulated based on the actual number of people in a space and
3) under utilized air from low occupancy areas of the building can be recirculated to provide fresh air rather than having to heat and cool incoming air.

Click on the calculator below to calculate ventilation rates for different applications, number and age of occupants, and the desired CO2 level.

Attachments:   11/13/2008: AirTestVentCalc-Heyoka.xls

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