18"w X 18"h Steel Return Air Grilles - Sidewall and Cieling - HVAC DUCT COVER - White [Outer Dimensions: 19.75"w X 19.75"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