Here at Ambient, we make choosing a floor vent a simple process. To figure out what size you need, remove your old vent, flip it over, and measure the bottom. The most common vent sizes are 4 inches by 10 inches and 4 inches by 12 inches. Secondly, you have to decide if you would like a flush mount grille or a drop in grille. The product on this page is a 4 inch by 10 inch flush mount vent grille - which means it will sit flush with the flooring once installed. Because it is a two piece vent, the center portion can pop out to access the duct below.
Please note that while this vent grill is labeled 4x10, the actual dimensions are a bit larger. Please see the above diagram for the precise measurements.
*Please note that it is not recommended to install wood vent grills in areas with foot traffic as the wood slats in the grill are not meant to support weight and can break easily if stepped on.