The 3M™ Secure Click™ Particulate Filter with Nuisance Level Organic Vapour Relief is NIOSH approved and helps protect against environments containing certain oil and non-oil based particles, and is also 3M-recommended for nuisance level relief of organic Vapour and for ozone protection up to 10X the Permissible Exposure Limit (PEL). Featuring 3M™ Secure Click™ Dual Flow Technology, this filter allows for easier breathing by utilizing four airflow paths. Get certified protection and improved functionality from the 3M™ Secure Click™ Particulate Filter with Nuisance Level Organic Vapour Relief.The 3M Secure Click Particulate Filter with Nuisance Level Organic Vapour Relief is compatible with 3M Secure Click HF-800 Series Reusable Respirators, replacing the round bayonet connector with the new 3M Secure Click Connection. This results in a quick, simple cartridge/filter connection that functions like a seat belt. Simply align the connections and push until you hear a 'click' and feel confident that filters and cartridges are installed properly.