... velocity 3.filtration Benzene and TVOC Activated carbon fiber felt (air purification) is made from viscose fiber by carbonization and activation ... , water treatment, gas mask, cigarette filtration material, nuclear air cleaning system, ozone elimination filter, gasoline vaporization protection for car, etc.Iodine ... .5/4/5mmWidth(max): 1.4m Activated Carbon Fiber Felt-air purification