The 3M™ Versaflo™ Air Flow Indicator, TR-971 is our flow indicator to confirm the manufacturers design minimum air flow rate of 3M™ Versaflo™ Powered Air Turbo is being exceeded. It's designed to enable checking at various elevations and temperatures to match the operational range of the respirator system.
The TR 971 air flow indicator may be used to confirm air flow levels of the TR 600 series PAPR. The TR 971 is designed to enable testing at various elevations and temperatures within the operational range of the PAPR system. See the User Instructions for details regarding how to use the TR 971.