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When using a 3M 2091 Particulate Filter in the field, it is important to change it frequently enough to ensure that you are still getting the necessary protection. I receive many questions asking about the lifetime of these filters. Here is one of the more recent questions: I know it depends on usage and environment, but are the 2091 particulate filters designed to be used and then stored until needed again or are they meant to be used once and then thrown out? If I use this filter f …