Labels:anechoic chamber | shelf OCR: Louver Evolution and Expansion or Non-Drainable Blade Louver Good airflow; very little rain defense "K" Non-Drainable Blade Louver Old "stormproof'; average airflow; very little rain defense Drainable Louvers Good airflow; some rain defense Wind Driven Rain Storm Resistant" Louvers Good airflow on vertical blade moderate airflow on horizontal blade; stops most wind driven rain "Hurricane Resistant L ouvers Florida Code Compliant Louvers Moderate airflow; most stringent tests; severe storm conditions; missile impact resistance mosi
