4" X 12" Floor Register with Louvered Design - Heavy Duty Rigid Floor Air Supply with Damper & Lever - White Black The total outer size of

The total outer size of this grille is the listed size plus 1

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With plain ends

1/2" White insulation will give you a good R value of 3

4" X 12" Floor Register with Louvered Design - Heavy Duty Rigid Floor Air Supply with Damper & Lever - White Black The total outer size of+ Product Details Size 4"w X 12"h is the size for the duct opening measurement only, actual front end outer dimensions are approximately 5. 5" X 13. 5" wider. Installation Location Floor. Design Rigid gauge built for durability and long life in mind, but still light and handy. Powder Coat Finish Smooth, shiny, scratch resistant, beautiful. Looks like it was just waxed. Quality Packaging Carefully shrink wrapped with cardboard backing to prevent damage