Cube Core Return Grilles A high rate of air flow efficiency in a fire-rated design. With low pressure drops and low sound levels, cube core return grilles are ideal for applications requiring efficient performance and a fire resistance rating. XG-CC5-FRS Series Sidewall or ceiling return grille with radiation damper. VER XG-CC5-FRS Series https://catalog-api.greenheck.com/api/category/es-419/600