4" X 12" Floor Register with Louvered Design - Heavy Duty Rigid Floor Air Supply with Damper & Lever - White Return Grille + Product Details Size –

+ Product Details Size – 16" x 20" or 20" x 16" is the size for the duct opening measurement only

+ Product Details Size – 4"w X 10"h is the size for the duct opening measurement only

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4" X 12" Floor Register with Louvered Design - Heavy Duty Rigid Floor Air Supply with Damper & Lever - White Return Grille + Product Details Size –+ 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