For use in circular ducts. Manufactured from pre-galvanized steel with aluminum vanes that are spring loaded. Backdraft dampers come in 4 in., 6 in., 8 in., 10 in. and 12 in. You can fit them into any position!

	Item No. Description Retail ABD-4 4 in. Backdraft Damper $27.95 ABD-6 6 in. Backdraft Damper $36.95 ABD-8 8 in. Backdraft Damper $41.95 ABD-10 10 in. Backdraft Damper $50.95 ABD-12 12 in. Backdraft Damper $60.95