Photo 1 of 4" Backdraft Damper, One-Way Airflow Duct Insert with Spring-Loaded Aluminum Blades, for HVAC Exhaust Fans and Range Hood Ventilation Systems

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Photo 1 of 4" Backdraft Damper, One-Way Airflow Duct Insert with Spring-Loaded Aluminum Blades, for HVAC Exhaust Fans and Range Hood Ventilation SystemsPhoto 2 of 4" Backdraft Damper, One-Way Airflow Duct Insert with Spring-Loaded Aluminum Blades, for HVAC Exhaust Fans and Range Hood Ventilation Systems