Naiture 2-1/4" x 14" Brass Floor Register Victorian Style Oil Rubbed Bronze Finish Duct opening size: 2-1/4" x 14" (Overall size: 3-3/4" x 15-7/8") Made of heavy-duty solid cast brass for durability. Finished with a durable oil rubbed bronze powder coat finish to resist rust. Louver control extension from register: 3/8" which could control air flow easily by foot. To determine size needed, measure air duct opening rather than old register or grille.