Air return grille is normally wall mounted and are positioned in line with the baseboard. Precision spaced louvers allow maximum airflow. Available Wood Species: Solid wood species: white oak, red oak, Brazilian cherry, maple, hickory, American cherry, santos mahogany, bamboo, American walnut, Brazilian walnut, and so on. Available Finishes: Unfinish, natural finish, medium finish, and any other prefinishes of a variety of wood species for your choice. Customized service: Dimensions, wood species, finishes, and other specifications can be customized according to customer's drawing, welcome OEM production.