Link Air Filter Section Height 25 In. Section Length 36 In. Total Length 36 In. Sections per Carton 1 Ply 1 Filter Efficiency 30 Percent Thickness 1 In. Frame Type Internal Wire Heat Sealed Inside Layers Air Flow 375 fpm Initial Resistance 0.21 In.WC Final Resistance 1 In.WC Max Temp 150 Degrees F Material Polyester Standards UL Class 900