Galvanized Back Draft Dampers SKU 4BDD Please select 4" BACK DRAFT DAMPER 48/BOX 5" BACKDRAFT DAMPER (12/BOX)6" BACKDRAFT DAMPER 48/BX 7" BACKDRAFT DAMPER 12/BX8" BACKDRAFT DAMPER 9" BACKDRAFT DAMPER 12/BX10" BACK DRAFT DAMPER 8/BOX Log in to view price