Acme Miami Home Industry ABD-6 6" BackDraft Air Flow Dampers Damper opens with air flow and closes when the air flow stops. Spring loaded with positive closure and a rubber gasket. Country of Origin: UKRAINE. Size: 5-7/8"D x 4-1/2"L. Dimensions: 6.25"Lx6.25"Wx6"H. Weight: 1 lbs.