The 3M™ Maintenance-Free Reusable Half Mask, 4000+ Series incorporating a newly engineered valve assembly that helps reduce exhalation-breathing resistance by over 30 %.

• Maintenance-free construction
• Easy to fasten neck strap
• Ready to use
• Low profile design for better peripheral vision
• Lightweight, well balanced design
• Soft, non-allergenic material with textured face seal
• Central position of the exhalation valve for effective removal of heat
• Use until damaged, particulate filters clog or gas filters become saturated
• Very good compatibility with panoramic eyeshield 3M™ 2890 and 2890SA