3M Speedglas Supplied air (SA) respiratory system. Includes V-100 Vortex air-cooling valve, belt, breathing tube, and complete 9100-Air helmet assembly. ADF sold separately. Lightweight belt-mounted valve permits welders to lower temperature of air entering headpiece by up to 50°F (28°C); designed for hot, strenuous jobs. Side windows - Shade 5 side filters that increase peripheral vision.