For use with the RPB PX5 powered air respirator system, this particulate filter offers respiratory protection against airborne dusts and mists to 99.99% efficiency down to an industry leading 0.12 micron. The filters unique design means the filter attaches securely to the PAPR, and the PAPR cover then affixes to the filter. This means that PAPR’s cannot be unwilling used without a filter in place Top Tip: Use RPB 03-890 Pre filters to extend the working life of the main filter