... in industry, agriculture, storehouses, scientific research work, etc.The mask is equipped with a drinking system. If necessary the face ... and comfort, and keeping the opening of inner mask unblocked. If the gas mask needs prolonged wearing, especially in hot weather, ... -and-forwards with your right hand, so undo the gas mask.5. Packing20pieces/carton, dimension: 350x840x500mm, total weight:22.0kg6. ...