3M 8833 3M 8833 filtering half mask, valve class P3. The 8833 respirator with a robust shell and cup-shaped design fits most face shapes and sits well on the face during use. Color-coded headbands provide easy identification of protection level. M-shaped noseband follows the shape of the nose. Robust outer shell provides extended service life. Cool Flow exhalation valve provides efficient removal of heat and moisture for more comfortable use. The advanced filter material provides low breathing resistance. Super soft inner material provides a softer feel against the face. The soft, flexible brim provides a more secure and comfortable fit. Protection factor 50.