Dampers Aluminum air control dampers featuring a 5″ U-shape frame with nominal 4″ air foil blade Louvers Aluminum fixed blade louvers featuring L-shaped frames in nominal 2″ and 4″ deep options Flex Connects Aluminum flexible duct connections. Choose from 2″, 4″, and 6″ fabric widths assembled with your choice of 30 or 45mm frame New Prototype 3D Printed L-Framed Backdraft Damper Prototype ✓ Low profile ✓ Reversible orientation Review Spec Sheet