VIKING 3250D FGS Powered Air Purifying Respirator - The NIOSH 42 CFR Part 84 approved loosing fitting positive pressure respirator purifies ambient air from the shop and delivers filtered, breathable air to operator. The top features include an intelligent blower system with HEPA filter, integrated grind shield & side windows and an extra-large widescreen 12.5 Sq. Inch auto-darkening lens with our exclusive 4C® Lens technology.