The Taihang TH6246V Cup-Shaped Acid Gas Protection Mask is designed specifically for low-concentration acid gas protection, and widely applicable to industries like automotive, chemical, papermaking, brewing, aluminum smelting and glass manufacturing. It has a built-in exhalation valve that reduces exhalation resistance and quickly expels hot, humid breath; the valve also features downward airflow diversion to prevent exhaled air from interfering with vision or affecting others, balancing protection and usability.