Duct opening size 4" x 12" (Overall size 5-1/2" x 13-7/8")
Made of heavy-duty solid cast brass for durability.
Finished with a durable chrome 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.