View 2 of (two set) HVAC OV Efficient 12'' Inch Backflow Damper - Vent Deflector - One Way Airflow Ducting Draft Blocker - Backflow Preventer - with Spring - Loaded Folding Blades 12" inch / 315mm

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View 1 of (two set) HVAC OV Efficient 12'' Inch Backflow Damper - Vent Deflector - One Way Airflow Ducting Draft Blocker - Backflow Preventer - with Spring - Loaded Folding Blades 12" inch / 315mmView 2 of (two set) HVAC OV Efficient 12'' Inch Backflow Damper - Vent Deflector - One Way Airflow Ducting Draft Blocker - Backflow Preventer - with Spring - Loaded Folding Blades 12" inch / 315mm