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AFNOR French Standardisation Association

INLET CONNECTION CONNECTOR TYPE CONNECTOR DESCRIPTION GAS PROPERTIES EXAMPLES OF GASES OR GAS MIXTURES
         
NFB NFB W 30 x 1.75 Oxidiser Industrial air
NFC NFC SI 21.7 x 1.814 Inert gases Argon, helium, nitrogen
NFE NFE SI 21.7 x 1.814 LH Flammable Hydrogen, hydrogen mix >4%
NFF NFF SI 22.94 x 1.814 INT Oxidiser Oxygen
NFG NFG SI 26 x 1.5 INT Oxidiser Nitrous oxide
NFH NFH W 22.91 x 1.814 LH INT Flammable Acetylene
NFJ NFJ W 25.4 x 3.175 Corrosive Chlorine
NFK NFK W 27 x 2 Corrosive Hydrogen chloride
NFL NFL W 27 x 2 Oxidiser Inert gases + oxygen mix > 21%
NFM NFM W 30 x 2 Oxidiser Inert gases + oxygen mix > 21% & CO2 < 7%
NFP NFP W 27 x 2 Oxidiser or corrosive Nitric oxide, nitrogen dioxide

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