4" X 24" or 24" x 4" Heavy Duty Floor Grille - Fixed Blades Air Grille - Brown [Outer Dimensions: 5.75 X 25.75] w26h26 75"H – fits a 18"

75"H – fits a 18" X 6" duct opening

+ Product Details Size – The size of 6" straight saddle stick on take-off is 6"/12" and it is compatible with duct 6"

designed to transition ducts from larger to smaller sizes

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+ Product Details Size – 4"h X 14"h is the size for the duct opening measurement only

4" X 24" or 24" x 4" Heavy Duty Floor Grille - Fixed Blades Air Grille - Brown [Outer Dimensions: 5.75 X 25.75] w26h26 75"H – fits a 18"+ Product Details Size 4"w X 24"h or 24" x 4" is the size for the duct opening measurement only, actual front end outer dimensions are approximately 5. 75" width X 25. 75" height. High Quality High grade steel construction meant for high foot traffic areas. Installation Location Floor. Design Easy drop in installation. Powder Coat Finish Smooth, shiny, scratch resistant, with no sharp edges. Looks like it was just waxed. Quality Packaging Carefully