These registers and return grilles are to be installed in a 12 x 18 vent opening. Most vent coverings either come with the damper (or louver) to control airflow or you can add them if needed.
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These registers and return grilles are to be installed in a 12 x 18 vent opening. Most vent coverings either come with the damper (or louver) to control airflow or you can add them if needed.