therwen backdraft damper duct manual volume damper with sleeve galvanized sheet adjustment airflow ducting branch hvac air balancing for range hoods, fans(1 pc,4 inch) 1 4 inch
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MSRP: $19.99
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therwen backdraft damper duct manual volume damper with sleeve galvanized sheet adjustment airflow ducting branch hvac air balancing for range hoods, fans(1 pc,6 inch) 1 6 inch
Amelia - Ohio Pike$2.50
Final priceEnded Feb 05, 2026
therwen backdraft damper duct manual volume damper with sleeve galvanized sheet adjustment airflow ducting branch hvac air balancing for range hoods, fans(2 pcs,6 inch) 2 6 inch
Dayton - Edwin C. Moses Blvd.$2.50
Final priceEnded Feb 04, 2026
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MSRP: $19.99