Photo 1 of 12" Butterfly Damper - Control Your Airflow on Drop Ceiling grilles of 24x24 (12" Round Duct Opening)

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Photo 1 of 12" Butterfly Damper - Control Your Airflow on Drop Ceiling grilles of 24x24 (12" Round Duct Opening)Photo 2 of 12" Butterfly Damper - Control Your Airflow on Drop Ceiling grilles of 24x24 (12" Round Duct Opening)