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Louver Selection and Application
FREE AREA CHART (SQUARE FEET)LouverLouver
HeightLouver Width In InchesHeight
Inches120114108102969084787266605448423630241812Inches
124.033.823.623.413.213.002.802.592.392.181.981.771.571.361.160.950.740.540.3312
186.906.556.205.855.495.144.794.444.093.743.383.032.682.331.981.631.270.920.5718
249.779.288.788.287.787.286.796.295.795.294.794.303.803.302.802.301.811.310.8124
3013.3812.7012.0211.3310.659.979.298.617.937.246.565.885.204.523.833.152.471.791.1130
3616.3515.5214.6913.8513.0212.1911.3510.529.698.858.027.196.355.524.693.853.022.191.3536
4219.3318.3417.3616.3715.3914.4013.4212.4311.4510.469.488.497.516.525.544.553.572.581.6042
4822.3021.1620.0318.8917.7516.6215.4814.3513.2112.0710.949.808.667.536.395.264.122.981.8548
5425.2723.9822.7021.4120.1218.8317.5516.2614.9713.6812.3911.119.828.537.245.964.673.382.0954
6028.2526.8125.3723.9322.4921.0519.6118.1716.7315.2913.8512.4110.979.548.106.665.223.782.3460
6630.5929.0327.4825.9224.3622.8021.2419.6818.1216.5615.0013.4511.8910.338.777.215.654.092.5366
7233.4731.7630.0628.3526.6424.9423.2321.5319.8218.1216.4114.7113.0011.309.597.896.184.482.7772
7836.3434.4932.6330.7828.9327.0825.2323.3821.5219.6717.8215.9714.1212.2710.428.566.714.863.0178
8439.2137.2135.2133.2231.2229.2227.2225.2223.2321.2319.2317.2315.2313.2411.249.247.245.243.2584
9042.0839.9437.7935.6533.5031.3629.2227.0724.9322.7820.6418.4916.3514.2112.069.927.775.633.4890
9644.9542.6640.3738.0835.7933.5031.2128.9226.6324.3422.0519.7617.4715.1812.8810.598.306.013.7296
10248.5746.1043.6241.1538.6736.2033.7231.2528.7726.3023.8221.3518.8716.4013.9211.458.976.504.02102
10851.5548.9246.2943.6741.0438.4135.7933.1630.5327.9125.2822.6520.0317.4014.7712.159.526.894.27108
11454.5251.7448.9646.1943.4140.6337.8535.0732.3029.5226.7423.9621.1818.4115.6312.8510.077.294.51114
12057.4954.5651.6348.7145.7842.8539.9236.9934.0631.1328.2025.2722.3419.4116.4813.5510.627.694.76120
FL-D-2 Selection and ExamplesExample 2:Example 1:Louver size given as 66" w x 54" h intake - determineAirflow given as 10,000 cfm - select louver size.
maximum airflow.A. Determine louver free area by dividing airflow by
free area velocity (do not exceed 928 fpm on intake
A. Use Free Area Chart to determine louver application).
Free Area = 13.62 ft.2
10,000 cfm ÷ 805 fpm = 12.42 ft.2
B. Multiply Free Area x Free Area Velocity (do Required Louver Free Area VelocityAirflow
not exceed 805 fpm on intake louver Free Area
applications).B. Select a louver with at least the required louver free
13.62 ft2 x 805 fpm = 10,964 cfm area from Free Area Chart above.
Maximum AirflowFree Area VelocityFree Area60" w x 48" h
12.42 ft. free area
C. Check the pressure drop of the selected 805 fpm free area velocity (10,000) cfm ÷
louver at the given airflow (Airflow 12.42 ft.2 F.A.
Resistance Chart on Page 2).(Other selections available - See Free Area Chart above.)
D P at 928 fpm = .126 in w.g.
Pressure DropFree Area VelocityC. Check the pressure drop of the selected louver
at the selected louver given airflow (Airflow Resistance Chart on Page 2).
! P at 919 fpm = 0.125 in w.g.
Pressure DropFree Area Velocity