DAMPER DESIGN, INC.

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BiPlane

Biplane Dampers : LESS DAMPER GIVES BETTER PERFORMANCE AND LOWER PRESSURE DROP. The double wall air sealed DDI BiPlane louver damper has no equal where total isolation by a louver style damper is required.

Blade and Const

DDI Louver Damper Blades DDI lover dampers have stressed skin welded airfoil blades, offering minimum flow resistance when open, maximum rigidity, lower thermal distortion, and long life in erosive service. DDI welded

Linkage

DDI Louver Damper Linkage DDI linkage is adjustable to permit field alignment after major maintenance. DDI linkage is maintenance free and durable. Side loads caused by crank alignment errors (kinematic locking) are

Louver

Louver Dampers : Louver dampers are best applied to balance or control flow. The normal leak path of 0.7% of duct area produces a three to five percent leak rate in average applications. As a general

DDI Guillotine Blade

DDI Guillotine Blade DDI guillotine blades are flat within one half of the blade thickness when hung vertically, providing low residual stresses. Thermal expansion slots in the blade prevent blade distortion. A seismic