Playalung Smog and Pollution Masks Smog, dust, and pollution masks.
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| In order to be able to breath properly in a mask when undergoing physical exertion, it is essential that the mask does not create either a pressure drop or back pressure when exhaling within the mask. Heat, carbon dioxide and water vapor, three components of exhaled breath, need to be exhausted from the mask in readiness for the next breath of inhaled air. If this process of evacuation fails or is impeded, then the mask may become uncomfortable with poor airflow and may result in the wearer not using the mask. The valves in Respro masks are designed to reduce or eradicate any of the above effects. |  |
Doctor Meu Says: The valves should not need replacing on a regular basis assuming that they are maintained properly. On a monthly basis, it is advisable to flush the valves through with warm water, allow to dry and apply a little talcum powder to prevent the valve from sticking. If you remove your valves, make sure you screw them back on correctly and tight!