The Model FSD-331 combination fire smoke damper by Greenheck is three-hour rated with Class I leakage, features a high-strength airfoil-style blade, and operates with velocity ratings up to 4,000 fpm.
The steel airfoil blade combined with Greenheck’s profile frame design creates the industry’s lowest pressure drop.
Model FSD-331 is available in a vertical mount with a maximum size of 120 inches wide x 96 inches high.
For more information on the Model FSD-331 combination fire smoke damper, visit www.greenheck.com
