M3 Polyester Link Air Filter, 600' L

M3 Polyester Link Air Filter, Section Height 20 In., Section Length 75 In., Total Length 600', Sections per Carton 8, 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, Standards UL Class 900. Only shipped in quantities of 4.