The 3M Adflo Powered Air Respirator, heavy-duty battery, 837731 is a self-contained breathing apparatus (SCBA) that provides effective protection against a range of particulates and gases encountered in the welding process. The Adflo respirator connects directly with any Speedglas Series respiratory welding helmet and can protect users against both particles and gases depending on the filter used. Gas filters are sold separately (837242 or 837542) . The Adflo respirator features a self-adjusting breathing tube with QRS (Quick Release Swivel) for easy one-handed connection and release. The system also includes an airflow indicator, prefilter, spark arrestor, particle filter, heavy-duty Li-ion battery, belt, and charger. The heavy-duty battery provides up to 13 hours of operation on a single charge, making it ideal for long-duration welding projects. The battery is also easily recharged in about 5.5 hours. The Adflo respirator is a comfortable and easy-to-use respirator that provides