As you breathe through them, these respirators filter out contaminants in the air. Throw them out when soiled, damaged, or breathing is difficult.

P95 respirators resist oil exposure for up to 40 hours and filter out 95% of solid particles.

Respirators with an exhale valve reduce breathing resistance and hot air buildup. They release your unfiltered breath out of the mask, so they are not for use in a medical setting.