12"w X 12"h Steel Return Air Grilles - Sidewall and Cieling - HVAC DUCT COVER - Black [Outer Dimensions: 13.75"w X 13.75"h] 12"w X 12"h Is The Size For The Duct Opening Measurement Only, Actual Front End Outer Dimensions Are 13.75" Width X "w X 13.75" Height - SEE BELOW IN DESCRIPTION HOW TO MEASURE A GRILLE High Quality Solid Stamped steel with Counter-Sunk Screw Holes (Screws Included) and No Sharp Edges Carefully Shrink Wrapped With Cardboard Backing To Prevent Damage In Shipment Easy Unrestricted Air Flow For Your HVAC System - 50 angled to provide maximum airflow Why BLACK? Simple, Because Black Grilles Always Look Sharp And Never Show Dirt & Dust Marks