Validation of Respirator Filter Efficacy

This objective of this project was to verify by direct measurement the filtration efficiency of the gas mask C2A1 canister in light of new bioaerosol threats. HEPA filters are routinely tested using an oil aerosol at the most penetrating particle diameter at 0.3 micrometer to verify that the efficiency is at least 99.97%. The program addressed two questions: 1. What is the filtration efficiency of the C2A1 canister under use conditions for the particle size range of potential biological threats in the 1 to 5 micrometers size range; and 2. What would be the likely dose under conditions of extended use in highly biologically contaminated areas?
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