Venus V44++ Respirator Meets The Requirement Of NIOSH N95, EN 149:2001+A1:2009 & ISI9473. These Respirators Should Be Used To Protect The Wearer From Solid And Non-Volatile Liquid Particles. Particulate Filter Respirators Are Classified By Filtering Efficiency And Maximum Total Inward Leakage Performance & Also By Inhalation Resistance. These Respirators Can Be Used To Protect Against Mechanically Generated Particulates Such As Those Generated From Sanding, Grinding, Drilling, Sweeping Etc. These Respirators Have Filters That Can Help Reduce Breathing In Pathogenic Biological Airborne Particulates Such As Influenza Virus.