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This test method of part 9 is applicable only to smoke extraction ducts that do not pass through into other fire compartments
— establishes limitations of the protection system and the acceptability of residual risks
Introduction of the code letters for temperature coefficient as given in EN 60062
and responsible manner
What is BS 3221-1 - Medicine measures specification about
Respiratory protective devices: threads for facepieces - Thread connection M 45 x 3 Ingestion-build-159183 This test method of part1 Scope This European Standard is applicable to self contained compressed air breathing apparatus designed as positive pressure breathing apparatus. This European Standard specifies a thread connection, M 45 x 3, which may optionally be used for facepieces for positive pressure breathing apparatus. This European Standard does not apply to negative pressure breathing apparatus, to closed circuit breathing apparatus or to diving equipment.