Green Pleated Filter Nominal Filter Size 20x24x4 Nominal Height 20 In. Nominal Width 24 In. Nominal Depth 4 In. MERV 13 Frame Type Moisture Resistant Die Cut Chipboard Nominal Pleat 85 Percent High Velocity 500 fpm High Initial Resistance 0.23 In.WC Final Recommended Resistance 1.0 In.WC Max Velocity 500 fpm Media Area 18.8 sq. ft. Max Temp 180 Degrees F Pleats per Linear Feet 15 Standards UL 900 Classified Actual Height 19-3/8 In. Actual Width 23-3/8 In.