20"w X 12"h Steel Return Air Grilles - Sidewall and Cieling - HVAC DUCT COVER - White [Outer Dimensions: 21.75"w X 13.75"h] Sidewall and/or Ceiling Grille Easy Unrestricted Air Flow For Youre HVAC System Carefully shrink wrapped with cardboard backing to prevent damage in shipment Screws Included No Sharp Surface Edges