Allegro Industries, 9904-CVWB, Deluxe Supplied Air Shield & Black Welding Helmet w/HP Control ValveThis is a cost effective system used by foundries, aluminum plants, mines, chemical plants, refineries, auto manufacturers, metal working and fabrications. Performance proven 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.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.Air Shield/Helmet:NIOSH approvedHead protection: ANSI Z89.1 Type 1 Class GMade of ABSLow profile and lightweight (3.620 lbs) (visor alone: 0.480 lbs)Quick release suspension for easy cleaningMade in USALens (Shield):Eye Protection: ANSI Z87.1-2003Protection Factor: APF 1000Made of anti-fog polycarbonateViewing area: 15' X 6.75' (38.1cm X 17.1cm)Visor (Welding Helmet):Made of Nylon 6Large #10 lens included4' X 4.75' (10.1cm X 12cm)Optional ADF lens sold separatelyADF Lens: (sold separately)ADF lens uses IntelliSense technology that allows unit to detect welds less than 5 ampsFour redundant sensors in a staggered design eliminate blocked sensorsVersatile cartridge fits in most 4' x 5' vertical windowsReplaceable lithium batteriesSmart View LCD for fingertip control informationLow battery indicatorSoft touch control panel eliminates contaminatesNeck Cape:Made of Stedprene (a fire retardant, polyurethane coated poly cotton fabric)Added comfortProtects user's neck from falling debrisDown Tube & Flow Controllers:Corrugated flexible and lightweight glass-filled nylon for greater comfort and less fatigueLow profile nylon adjustable waist belt.