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Toggle Fixed-installation humidifiers subsection. 5.1 Drums. 5.2 Disc wheels. 5.3 Bypass ... The cost of these filters is about $10–15 per cartridge or 10-pack for ...
To eliminate most complaints caused by CO 2, the total indoor CO 2 level should be reduced to a difference of no greater than 700 ppm above outdoor levels. [90] The National Institute for Occupational Safety and Health (NIOSH) considers that indoor air concentrations of carbon dioxide that exceed 1000 ppm are a marker suggesting inadequate ...