BS EN 148-3:1999

Respiratory protective devices: threads for facepieces. Thread connection M 45 x 3 | Status: Current, Under review

1 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.