![]() ![]() A concentration of carbon dioxide (CO2) over 0,5% for several hours can be considered very high in sealed environments such as shelters and bunkers. This makes carbon dioxide (CO2) the major pollutant inside shelters and bunkers. People produce carbon dioxide while breathing, an average human exhales about 20 liters of carbon dioxide per hour. However, in low-cost Underground Bunkers and Bomb Shelters with no ventilation the carbon dioxide (CO2) starts to build up very quickly. A ventilation unit should be installed to pass contaminated air through a filter that will purify the air supplied to the room. Underground Bunkers and Bomb Shelters with no air filtration are the simplest and lowest in cost since ventilated safe room requires an external ventilator. To maintain a safe environment in Underground Bunkers and Bomb Shelters, it is crucial to have the capability to cut off the outside source of air in case of a nuclear attack or accidental release of industrial chemicals in addition to other harmful gases such as smoke, carbon monoxide.
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