Continental Fan Manufacturing Back Draft Dampers. Foam gasket prevents air leakage. Back Draft Damper blocks and controls draft. 4" thru 16" Duct sizes available.
FAMCO Back Draft Damper in Connecting Sleeve. Opens with Normal Air Flow - Closes with Gravity. No Springs or Metal Hinges. Duct Sizes 4" - 20". *** QUANTITY SAVINGS ***
FAMCO Reversible Back Draft Butterfly Damper with Wall Vent. Reversible Air Flow direction - Air Intake or Exhaust. Galvanized or Aluminum Vent. 4" thru 12" Duct. *** QUANTITY SAVINGS ***