800ppm is "on the line" per what's industry recommended for an office http://www.energy.wsu.edu/documents/co2inbuildings.pdf http://www.energy.wsu.edu/documents

800ppm is "on the line" per what's industry recommended for an office http://www.energy.wsu.edu/documents/co2inbuildings.pdf http://www.energy.wsu.edu/documents/co2inbuildings.pdf