Storm resistant louvers are designed and rated to provide high volume intake, exhaust ventilation and prevent water penetration under the most severe wind-driven rain conditions. Maintaining a Class A (99%) effectiveness rating when tested for wind-driven rain in accordance with various AMCA ratings is a key element. However, carrying over specifications from one job to another could lead to improper pressure drop. We have a variety of strategies to give you the design you want, while keeping your mechanical engineer happy.