Particulate Respirator 8511 Box/10 3M 3M™ Particulate Respirator #8511. N95 approved. With 3M™ CoolFlow™ Valve. For sanding, grinding, sawing and insulating particles. For workplace/occupational applications only. Box of 10. NOTE: Always read full user instructions and warnings included with the product before using. Improper use may result in sickness or death.