The Millennium mask using this filter provides first responders with effective respiratory protection against chemical, biological, radiological and nuclear (CBRN) agents that might be used in a terrorist attack. (NIOSH Approval number TC-14G-0270 note that NIOSH approval comes only when paired with the CBRN Millennium respirator).

*Specifically designed for biological / chemical/ radiological agents
*Particulate filter is over 99.99% efficient against all particulates and is appropriate for protection against all biological aerosols
*Exceptionally high particle-filtration capacity and low breathing-resistance.
*Standard 40mm NATO threaded, fits most masks including the MSA Millenniumand Advantage 3100 (or the Advantage 1000 and 3200 with an optional 40mm adapter) BUT the NIOSH Approval is only valid with the CBRN Millennium mask.