Performance proven and a cost effective respirator used in foundries, aluminum plants, mines, chemical plants, refineries, auto manufacturers, metal working and fabrications. With a constant and powerful supply of breathable air from a clean air source, this Helmet offers protection from airborne contaminates including hexavalent chromium applications, flying debris, sparks, chemical and molten metal splashes. The welding shield flips allowing user to grind and clean metal looking through clear ANSI face shield. Large #10 lens included. Complies with ANSI Z89.1 Type 1 Class G for head protection; ANSI Z87.1+ for face-shield/eye protection. NIOSH approved Complete PAPR assembly includes welding shield w/ #10 lens, downtube w/ FR cover, blower, battery, charger, flow tester and HEPA filters. PROTECTION FACTOR: A Certified 3rd Party Testing Lab was contracted to conduct a Simulated Work Place Protection Factor Study on the 9904 Series Respirator. The results of this study indicated that 9904 samples tested yielded 5th percentile protection factors greater than 1,000 thus allowing Allegro to claim that the 9904 Series Respirator qualifies for an APF of 1000 as permitted by OSHA*. *Per OSHA Assigned Protection Factor, Federal Register Notice 71:50121-50192, Dated 8/24/2006. Supporting test data is available upon request from Allegro Industries.