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CS-2009 IEQc1:Outdoor Air Delivery Monitoring

Calculating CO2 Concentrations in a Zone

Hi! I'm finishing a project and must indicate the levels to be configured in ppm CO2 sensor environments. As an example, I have a training room with 8 people and an area of ​​497.29 sf. The project has a mechanical ventilation system with a flow rate of 254 cfm. What value do I indicate the sensor? How do I know the ppm level as the project? How do I calculate it? Thanks!

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Michael Smithing
Director - Green Building Advisory
Colliers International Ltd.
LEEDuser Basic Member
201 thumbs up

Mon, 01/14/2013 - 16:13

CO2 sensor values are typically set relative to the outside environment. I found this table, which appears to be in line with most discussions I've had with experts: - normal outdoor level: 350 - 450 ppm - acceptable levels: < 600 ppm - complaints of stiffness and odors: 600 - 1000 ppm - ASHRAE and OSHA standards: 1000 ppm - general drowsiness: 1000 - 2500 ppm - adverse health effects expected: 2500 - 5000 ppm - maximum allowed concentration within a 8 hour working period: 5000 ppm If you set the sensor for 600 ppm you should be OK.

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