Product Details: 1.Frame:Anodized extruded aluminum,Galvanized steel 2.Media:Melt-blown PP 3.Efficiency:G4~F9/MERV7~MERV14 4.Large media area,Steady structure 5.Application:Cleanroom MAU ,Automotive industry 6.Classified by Underwriters Laboratories as UL 900 http://www.unigreen-tech.com/