QS S-Face Mask with S-Breathing Valve. Inner mask separates inhaled and exhaled air to minimize the danger of breathing exhaled carbon dioxide. Ambient air hatch. Positive lock on breathing valve. Silent operational mode. Fits spectacles and communications equipment. Available in 3 sizes. NFPA 1981:2002, EN 136 Class 3, EN 137 certified. Dimensions: 250 x 160 x 150 mm. Weight: 0.88 kg.
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