4" Adjustable Damper Kit with Hardware.
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4" ADJUSTABLE DAMPER:
Adjustable Dampers are used to control airflow through a duct run. The disk is sheet metal and is attached internally to a T-Wyes, Elbow, or start collar. A hole is drilled for attaching the damper handle and screw assembly for adjusting the airflow opening. Sizes are 4" to 18" diameter.