ULPAFilterManufacturs Feature and Advantage Eco-friendly Specification Filter frame:aluminum/galvanized steel/SS Faceguard:glass fiber/plastic coated metal Construction:Panel Filter EN1822 standard Efficiency:u15 Porosity:0.12 micron H3 (EN1822) Application Air filtrationULPAFilterManufacturs website:http://www.puro-techs.com/ulpa-filter/