3M™ Cupped Particulate Respirator 9926, P2 with Nuisance Level* Acid Gas Relief, valved (Pack of 10)The 3M 9926 disposable acid gas respirator is designed to help provide quality and reliable respiratory protection to workers from nuisance levels* of acid gas, such as, sulphur dioxide and hydrogen fluoride. The 9926 particulate respirator is compatible with other 3M personal safety products, e. g. eyewear and earplugs. Protection factor: 10 x Workplace Exposure Standard Packaging: 10 respirators box, 10 boxes case *Nuisance levels are those levels