The 3M ADFLO Powered Air Filter Unit can be used specifically for high-efficiency particulate filtration (only) or for both particulate and gas filtration depending on filter selection. The 3M ADFLO unit is equipped with a particulate filter, spark arrestor, pre-filter, heavy-duty battery, charger, particulate filter indicator to indicate particulate filter clogging, and a belt. A range of gas filters (optional) provide additional protection against certain gaseous contaminants. An odor filter (optional) reduces unpleasant odors. The ADFLO unit provides a constant nominal airflow of either 170 l/min or 200 l/min (depending on user settings), regardless of battery charge level or particulate filter clogging. Gas filters are sold as separate accessories; you can replace the particulate or gas filters as needed.