The 3M™ Secure Click™ Particulate Filter is NIOSH approved and helps filter at least 95% of certain airborne non-oil-based particles. 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.The 3M Secure Click Particulate Filter is compatible with 3M Secure Click HF-800 Series Reusable Respirators through the 3M Secure Click Filter Retainer D701 and 3M Secure Click Cartridge. This system replaces the round bayonet connector with the new 3M Secure Click Connection, resulting in a quick, simple cartridge/filter attachment 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.