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3M Adflo air-powered unit with QRS self-adjusting breathing hose; with airflow indicator, pre-filter, spark arrester, particulate filter, heavy-duty battery, belt and charger; if you use the right type of filter, the filter ventilation unit will effectively protect you from particles and gases - all in one system; gas filters are sold as separate accessories; you can replace the particle or gas filters as needed; air always flows at a constant nominal speed of 170 liters per minute, regardless of the level of battery charge or the degree of particle clogging of the filter