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Understanding AMCA Standard 500-L Louver Tests

What testing in accordance with the standard does and does not prove.

Editor’s note: This article is adapted from the Air Movement and Control Association International Inc. white paper “Understanding the ANSI/AMCA Standard 500-L Tests,” which is available to download at no cost at

Louvers are designed to protect air-intake and exhaust openings from the infiltration of unwanted water or particles while allowing airflow into a space, with di

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