Replace your Secure Click cartridges with NIOSH-approved particulate filters from 3M. The Secure Click system swaps easily and provides a satisfying 'click' sound to assure you of a proper install. The filter is designed for relief from 'nuisance' certain organic vapors, as well as both oil and non-oil based air particles. 3M Secure Click Particulate Filter P100 with Nuisance Level OV Relief