3M Particulate Filter 7093, P100 Respiratory Protection  (Pack of 12) Exceptional 99.97% filter efficiency meets NIOSH P100-series test criteria Plastic filter encasement designed for high heat or wet applications An innovative solid-top air-inlet reduces premature loading Channeled airflow protects filter for enhanced breathability and longer service life Unique, spring-loaded filter cover design simplifies negative pressure user seal checks