Dissolved Oxygen and Carbon Dioxide

atmosphere CO2 is produced by body metabolism and is a normal component of exhaled breath It also results from the burning of fossil fuels and natural sources such as volcanic eruptions CO2 levels in outdoor air typically range from 300 to 400 ppm (0 03 to 0 04 ) but can be as high as 600-900 ppm in metropolitan areas

Why Measure Carbon Dioxide Inside Buildings?

1,400 ppm suggests about 10 cfm (or less) 1,050 ppm 2,400 ppm suggests about 5 cfm (or less) 2,050 ppm Note: The CO 2 values in this table are approximate, and based on a constant number of sedentary adult occupants, a constant ventilation rate, an outdoor air CO 2 concentration of about 380 ppm, and good mixing of the indoor air Is it that

Measuring Carbon Dioxide Inside Buildings – Why is it Important?

1,035 ppm (380 ppm + 650 ppm = 1,030 ppm) • If the outdoor CO 2 is around 380 ppm, the relationship of the ventilation rate (cubic feet per minute of fresh air delivery) per person and the steady-state CO 2 concentra-tions should be close to these values: – 600 ppm = 25 cfm OSA per person – 800 ppm = 20 cfm OSA per person

ANSI/ASHRAE Addendum d to ANSI/ASHRAE Standard 621-2016

Mar 02, 2018 · range from 300 to 500 ppm High CO 2 concentrations in the outdoor air can be an indicator of combustion and/or other contaminant sources Figure D-3 shows the outdoor airflow rate required as a function of physical activity and steady-state room concentra-tion If the activity level is greater than 1 2 met, the required

ASHRAE Technical FAQ

ventilation rates and maximum levels of indoor contaminants and other chemicals for acceptable indoor air quality Copies of the standard, the latest addenda, and other publications may be purchased on-line at our website, www ashrae or by calling 1-800-527-4723 in the USA and Canada or 1-404-636-8400 worldwide Addenda to

Furnaces CO Emissions Under Normal and Compromised Vent

concentrations in the flue gas ranged from 399 ppm to more than 3,400 ppm, respectively The current ANSI Z21 47 standard (1998) requires that an air-free flue gas sample of CO not exceed a maximum of 400 ppm (0 04 percent) when a furnace vent is either partially or completely blocked • During disconnected vent tests: