Reggio Studio's louvers provide functional air control for their handmade American grilles, crafted from premium quality materials and backed by a lifetime guarantee. These louvers regulate airflow volume to enhance heating and cooling efficiency, mounting behind grilles and operating with a simple flathead screwdriver adjustment. Installation is straightforward with included foam strips, though grille removal may be necessary in some cases. Requires 2 5/16" clearance behind the grille. We recommend pairing it with the adjustable louver for optimal airflow performance.