The Moldex 2310N99 premium particulate respirator is suitable for most welding applications. The N99 is for a higher level of protection. Workers stay cooler with an exhale valve that reduces breathing resistance and hot air build up. Its 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 costs. Shaped for comfort with a contour molded nose bridge and the soft foam nose cushion, makes it easier to wear and provides more all-day comfort for more of the work force. The 2310N99 premium particulate respirator is NIOSH certified to have a filter efficiency of 99% or greater against particulates free of oil. This product meets heat and flame resistance in accordance with ANSI/ISEA 110-2003 Section 7.11.1. If used for welding, wear appropriate eye and face protection. Suggested applications include: welding, soldering, brazing, torch cutting, metal pouring, and dusty environments.