When to change your filter depends on what you are wearing your B2 Mask for, and which filters you are using. Refer to the following table for guidelines about when to change your filters:
*A B2 Filter Lite set lasts for up to 24 hours of wear time, up to 1 month after opening. An original B2 Filter set lasts for unlimited wear time up to 1 month after opening
You should also change your filters if they get wet or if you think they have been contaminated. The mask cannot eliminate the breathing in of all particles and cannot eliminate the possibility of getting sick. The filters must be changed at regular intervals to ensure the highest level of protection.
The facepiece, filter caps, and fabric overlay may be washed by hand using a mild soap or detergent. Alternatively, you can place them all in a laundry delicates bag and machine-wash them on the delicates cycle in cold water.
When not in use, the B2 Mask can be folded in half with the overlay straps used to secure it closed. Alternatively, the mask can be left on a clean surface or hung somewhere that is out of the way. Do not store in a sealed container because this prevents moisture evaporation.