Allegro 9200-01A 1-Worker Full Mask Breathing Air Blower Respirator System w/ 50’ Hose Full Mask Breathing Air Blower Respirator Systems Our Full Mask Breathing Air Blower Respirator Systems provide a portable air source for one or two respirator users. They include one or two NIOSH approved full mask supplied air respirator(s), a breathing air blower, flow meter, and one or two 50 foot breathing air hose(s). Includes NIOSH approved respirator(s).