Photo 1 of QWORK Draft Blocker 12 Inch, Damper Stopper Duct Damper Backflow Preventer Inline Built-in Fan Vent Ventilation Vent Deflector

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Photo 1 of QWORK Draft Blocker 12 Inch, Damper Stopper Duct Damper Backflow Preventer Inline Built-in Fan Vent Ventilation Vent DeflectorPhoto 2 of QWORK Draft Blocker 12 Inch, Damper Stopper Duct Damper Backflow Preventer Inline Built-in Fan Vent Ventilation Vent Deflector