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AMCA Standard 500 provides a reasonable basis for testing and rating louvers and is performed under a certain set of laboratory conditions. This does not guarantee that other conditions will not occur in the actual environment where louvers must operate.

Airflow given as 10,000 cfm - select louver size.

Example 1:
A. Determine louver free area by dividing airflow by free area velocity (do not exceed 1000 fpm on intake louver application, check manufacturer’s published data).
B. Select a louver with at least the required louver free area from the Free Area Chart.

(Other selections available - See Free Area Chart )
C. Check the pressure drop of the selected louver at the given airflow (see Typical Pressure Drop Chart).

Example 2:
Louver size given as 48 x 72 intake - determine maximum airflow.
A. To determine this, use the Free Area Chart.
B. Multiply Free Area x Free Area Velocity (do not exceed 1000 fpm on intake louver application, check manufacturer’s published data).
C. Check the pressure drop of the selected louver at the given airflow (see Typical Pressure Drop Chart).

 
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