Compliance: CE EN175 Four specially designed indirect vents in the frame for welding workplace. The valves can be used with and without ventilation as a 2 in 1 model. Green soft vinyl frame with 50mm clear and green#5 filter glass flip front lens, can switch from welding to chipping for easy inspection. Suitable for gas welding , cutting or torch brazing. Protection against high speed particles F (45 m/s)