Acceptable Oxygen Levels For Confined Space Entry Are - However, any oxygen level greater than. Web an atmospheric oxygen concentration below 19.5% (oxygen deficiency), or above 23.5% (oxygen enrichment). Web an oxygen content of 19.5 percent can support life and is adequate for entry. The oxygen concentration must be maintained between 19.5% and 23.5%.
The oxygen concentration must be maintained between 19.5% and 23.5%. However, any oxygen level greater than. Web an oxygen content of 19.5 percent can support life and is adequate for entry. Web an atmospheric oxygen concentration below 19.5% (oxygen deficiency), or above 23.5% (oxygen enrichment).