3M™ Cupped Particulate Respirator 9923V, P2, with Nuisance Level* Organic Vapour Relief, valved (Pack of 10)The 3M 9923V is a disposable specialty respirator with a non aluminium nose clip designed specifically for use in flammable atmosphere, e. g. coal mines. The 9923V 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, 6 boxes case *Nuisance levels are those levels below the Workplace Exposure Standard Proper selection, training and