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.
When installed inside the filter cover of the TR-300 PAPR, the TR-362 spark arrestor helps protect the HE filter and PAPR unit from damage due to sparks or other hot materials.