Grade D breathable air is a guideline enforced by OSHA and described by ANSI and the Compressed Gas Association Commodity Specification for Air. To meet the requirements for grade D air, there must be a lack of noticeable odor and the oxygen, hydrocarbon, CO and CO2 content all have to meet specified regulations. With a grade D single line air hose system from CitiSafe Pte Ltd., you can achieve grade D air while only using one hose to breathe and spray.
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