One-way valves offer an improved flow rate while you exhale air, helping to eliminate moisture from your face and mask. In contrast, the new Exhalation Valve Caps do not allow any air to pass through the valves - causing 100% of your exhaled breath pass through the mask filter. This design helps to further prevent the spread of airborne particulate or germs to those around you in tight indoor spaces.
Some states now encourage or require this design, and we suggest checking with your local authorities.
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