AMCA-rated for Air Performance and Wind-Driven Rain, ECV-645-MD 6 in. deep, vertical blade louver has free area of 46% and withstands extreme loads, debris impact, and cyclic fatigue associated with severe weather effects of hurricanes. Unit is approved by Florida Building Code and tested in accordance with AMCA 540 and 550. Facilitating and accelerating attachment to any substrate without mechanical anchors, optional anchorless installation utilizes flanged clips and retaining angles.