Ventilation Studies
Carbon dioxide can be used as a surrogate indicator of building ventilation.
Carbon dioxide (CO2) is generated by building occupants as a product of respiration. The indoor CO2 concentration will increase with the number of building occupants and their activity level.
The ventilation rate is the indoor/outdoor air exchange rate.
As “fresh” air outside air is delivered to the indoor space by the mechanical air handling system, it will dilute and remove any airborne indoor contaminants.
Given a reasonably constant indoor CO2 generation rate and a constant ventilation rate, CO2 levels will approach an equilibrium condition. At equilibrium, when the indoor CO2 concentration is maintained at a level that is less than about 650 parts per million (ppm) above the outdoor CO2 concentration (usually about 350-400 ppm), the ventilation rate is greater than the present minimum design requirement of 15 cfm of outside air per person. Office buildings should be designed to deliver 20 cfm of outdoor air per person.
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(732) 842-5564
P.O. Box 8576
Red Bank, NJ 07701