Moldex® 2310N99 premium particulate respirator is certified N99 for a higher level of protection. NIOSH certified to have a filter efficiency of 99% or greater against particulate aerosols free of oil. Suitable for most welding applications. Meets heat and flame resistance in accordance with ANSI/ISEA 110-2003 Section 7.11.1. Workers stay cooler with an exhale valve that reduces breathing resistance and hot air build up. The exclusive Dura-Mesh® shell protects the filter media so it stays cleaner looking longer. Plus it resists collapsing, even in heat and humidity so the respirator holds its shape longer. The result is fewer respirators used and lower cost. Easier to wear and more all-day comfort for more of the work force and without a metal noseband.