The grille needs a floor opening of 12" long by 10" wide. Has its louvers that work very well.One louvers plate has a small section missing... This is a VERY nice old grille! The item "ANTIQUE VICTORIAN Cast Iron Floor Grille 12x10 Heat Grate Register with Louvers" is in sale since Sunday, December 25, 2016. This item is in the category "Antiques\Architectural & Garden\Hardware\Heating Grates & Vents". The seller is "ladybug007" and is located in Newport, Vermont. This item can be shipped to United States.