How might CO2 accumulate at a dangerous level in a residential property?
Carbon dioxide, CO2, from a small leak is unlikely to be dangerous, as it can be expected to be diluted with fresh air mixing in a building. But there can be exceptions in which carbon dioxide may accumulate and reach higher, even dangerous concentrations indoors. Flue gas spillage: in an enclosed gas-fired boiler room with a deficient chimney draft can produce high levels of CO2. In a case in which there is sufficient combustion air, say from a direct air duct to the gas burner, the system may not be producing more dangerous carbon monoxide (CO), but the heating system may nonetheless spilling flue gases with a high level of CO2 into the room from a defective chimney. Since CO2 being more dense than air it may accumulate in an enclosed basement, crawl space, or boiler room. Alternatively, because the CO2 in this case is a heating system exhaust, it may be warmer than surrounding air and it may rise upwards in the building into the living space. For this reason when we measure for the
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