4" X 8" Floor Register with Louvered Design - Fixed Blades Return Supply Air Grill - with Damper & Lever - White 18" Round Duct Pipe The 1/2" black insulation

The 1/2" black insulation

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But they are also the most visible representation of you air system

as the multidirectional design ensures consistent temperature control

4" X 12" Is The Size For The Duct Opening (floor/vent hole) Measurement Only

4" X 8" Floor Register with Louvered Design - Fixed Blades Return Supply Air Grill - with Damper & Lever - White 18" Round Duct Pipe The 1/2" black insulation+ Product Details Size 4"w X 8"h is the size for the duct opening measurement only, actual front end outer dimensions are approximately 5. 5" X 9. 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