Louver Free Area Calculation. PDF fileNet Free Area (NFA) Net venting area adjusting for insect screen louvers and weather coverings The net free area is always less than the actual area Screen Factor (SF) Adjusts for airflow obstructed by screens and louvers Eave Vent Gable Vent Roof Jack Soffit Vent Screen Factor (SF) Mesh SF w/o Louvers SF w/Louvers 1/4” or 1/2” 10 20.
Free area can be found on a louver’s submittal along with other important performance metrics The louver’s total free area will be listed in a table by the louver’s width and height Manufacturers calculate the total free area of each louver at various dimensions up to the louver’s maximum dimensions Pressure Drop (in wg at FPM).
Calculating free area for louvered grille DoItYourself
Specify the correct CS Louver with the proper free area and pressure drop every time Input your louver’s width and height Then select your wind load criteria and select Calculate If you know your HVAC fan’s CFM input your cubic feet per minute requirement Click the Calculate button and your specific data will appear.
How to Calculate Louvre Pressure Drop Blog CS UK
PDF fileFree area is derived by taking the total open area of a grille/louver (after subtracting all obstructions blades and frame) and dividing by the overall wall opening This gives a comparison of a grille/louver opening to an unobstructed opening Every grille/louver no matter what size has a calculated free area By subtracting any obstructions to.
Louvers Engineering Guide Price Industries
16 rowsFree Area of Wall Louvers Every louver no matter what size has a calculated free area By Product Model Free Area First Point of Water PenetOverall PerformPressure Loss a E6JN 691% 915 fpm 9014 cfm 012 E4DP 593% 930 fpm 8826 cfm 012 E4JP 584% 960 fpm 8976 cfm 013.
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PDF filefree area) As an example a 48” x 48” x 4” deep louver may have 88 sqft of free area (55%) a 48” x 12” of the same model would have 15 sqft (37%) As a general rule avoid selecting a louver when its height is less than 4 times its depth The actual free area should always be checked when designing a louver below 48” in height When the louver height exceeds 48” the percent .