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Airolite - AMCA 500 L Water Penetration Louvers Test

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Published on Feb 17, 2014

Airolite Louvers - http://www.airolite.com/Products.aspx...

AMCA 500-L has two very different procedures relative to weather simulation for louver products.

The AMCA 500-L test for Water Penetration simulates rain falling straight down in front of a louver at a rate of 4 inches per hour with a fan behind attempting to pull the water through the louver. The free area velocity up to 1250 feet per minute where only 0.01 ounces of water per square foot of louver free area is measurable is considered the Beginning Point of Water Penetration. Conventional louvers like the Airolite K609 or K638 typically have a Beginning Point of Water Penetration around 600 feet per minute free area intake velocity.

Conventional drainable blade louvers like the Airolite K6746 typically have velocities at Beginning Point of Water Penetration in excess of 1000 feet per minute free area intake velocity.

Conventional non-drainable or drainable blade louvers perform well in most application, however; they lend very little defense against wind-driven rain. For this reason it is critical that building designers ensure provisions to manage water penetration even if the louvers are sized well below the velocity at beginning point of water penetration.
When provisions to manage weather are more limited Airolite recommends the application of wind-driven rain style louvers such as our SCH601 or SCV602.

The AMCA 500-L test for Wind-Driven rain is considerably more dynamic.

The Wind-Driven Rain test simulates external wind speeds of 29 or 50 MPH while spraying water directly at the face of the louver at a rate of 3 or 8 inches per hour. 3 inches occurs at 29 MPH and 8 inches occurs at 50 MPH. Behind the louver is a fan attempting to pull the wind-driven rain through the louver.

At specific escalating inlet velocity points the product is judged with a letter grade rating of A, B, C or D. Class A is defined as minimum 99% effectiveness. Class D is defined as less than 80% effective.
Horizontal blade wind-driven rain louvers like the Airolite SCH601 provide excellent defense against wind-driven rain.

Airolite SCH601 maintains Class A wind-driven rain performance up to 1391 feet per minute free area intake velocity during the 29 mile per hour 3 inch rain per hour test. During the 50 mile per hour 8 inch rain per hour test SCH601 maintains Class A wind-driven rain performance up to 1232 feet per minute free area intake velocity.
For maximum defense against wind-driven rain Airolite recommends vertical blade louvers like the Airolite SCV602.

Airolite SCV602 maintains Class A wind-driven rain performance up to 2030 feet per minute free area intake velocity during both the 29 mile per hour 3 inch rain per hour test and the 50 mile per hour 8 inch rain per hour test.
For more information on the AMCA 500-L test for Water Penetration or Wind-Driven Rain or more information on Airolites' industry leading line of performance louver products please consult your local Airolite representative or visit us at www.airolite.com.

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