Lau’s round backdraft damper was developed in response to industry requirements for a round backdraft damper with low leakage and easy to install in round spiral duct work. The specially designed blades with closing spring insure a tight seal to minimize back flow through the damper. Lau’s exclusive blade hinge design has no frame penetrations to allow air leakage out of the duct. Integral rolled blade stop insures correct installation of blade seal and positioning of blades in the damper. The damper can be used for vertical and horizontal air flow conditions.
CRBD2 Round Backdraft Damper Catalog
Backdraft Damper Ordering Made Easy