Photo 1 of 8"/200mm HVAC Duct Manual Backdraft Damper - Stainless Steel Airflow Ducting Branch VentDamper Air Control Valve, Adjustment Handle for HVAC Duct Systems

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Photo 1 of 8"/200mm HVAC Duct Manual Backdraft Damper - Stainless Steel Airflow Ducting Branch VentDamper Air Control Valve, Adjustment Handle for HVAC Duct SystemsPhoto 2 of 8"/200mm HVAC Duct Manual Backdraft Damper - Stainless Steel Airflow Ducting Branch VentDamper Air Control Valve, Adjustment Handle for HVAC Duct Systems