The active carbon high filtration dust mask with double exhalation valves is more suitable for high temperature, high humidity and sultry places. It can efficiently filter tiny dust.

There is a exhalation valve on each side of the dust mask, commonly called "twin-valve". It is a new product designed by Dasheng and we have already applied for patent toward the national patent bureau. This dust mask is suitable for high temperature, moist and sultry places and especially suited to strong manual labor. It can help wearers expel waste gas in body farthest in a twinkling and breathe in fresh air in time to guarantee comfort and health.