The 3M™ Particulate Filters 7093 Series are designed to help protect in higher-heat and wet applications with a swept-back plastic encased filter. An innovative solid-top air-inlet can help reduce premature loading by allowing a channeled airflow. The P100 filters have a unique, spring-loaded filter cover to assist in performing negative pressure user seal checks. Simply press or squeeze the filter covers to restrict airflow and inhale gently to check for proper seal of the respirator.