Check the listing for details. 3M Airflow Indicator/Flow Meter For 3M Breathe Easy and Powerflow PAPR Systems. Condition: New. Listed at 23.50 USD. 3M Airflow Indicator/Flow Meter For 3M Breathe Easy and Powerflow PAPR Systems3M rated airflow indicator to be used with the Powerflow and the Breathe Easy powered air purifying respirators only. Level marks have been printed on the tube – markings differ depending on which system is in use – to allow one to keep an eye on the respiratory protection quality. If the ball indicator falls below 4CFM (4 ft.3/min), it means the filter has reached its saturation limit or there may be a malfunction in progress. Sold individually.3M manufacturer’s code: 520-01-21SpecificationsBrand3M™Case Quantity1/packCompatible RespiratorAirstream, Breathe Easy Series, Powerflow, Airstream, Breathe Easy Series, PowerflowHeadgear TypeFull FacepieceProduct ColorTransparentProduct SeriesBreathe EasyProduct TypeAir Flow IndicatorTDS RequiredYes