// CODE SNIPPET
401.6.1 Wind-Driven Rain Rating
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All exterior louvers for building ventilation systems shall either:
- Receive an A rating according to AMCA Standard 550 for wind-driven rain penetration for a 50 mile per hour (80.4 km/h) wind velocity with a rainfall rate of 8 inches (203 mm) per hour; or
- Be installed on a plenum configured to intercept any wind-driven rain penetrating the louver and to prevent the rain from entering the building ductwork system. Such plenum shall be waterproofed and equipped with a drainage system to convey water penetrating the louver to storm or sanitary drains.
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