4" X 18" Or 18" X 4" Heavy Duty Floor Grille - Fixed Blades Air Grille - Brown [Outer Dimensions: 5.75 X 19.75] 8" Diameter + Product Details Size – Compatible With Duct 7in Applications This sheet metal DDAG-A-1212

+ Product Details Size – 18"w X 20"h is the size for the duct opening measurement only

+ Product Details Size - 30"w X 8"h Is The Size For The Duct Opening Measurement Only

+ Product Details Size - 12"w X 36"h is the size for the duct opening measurement only

this filter grille never rusts and withstands long-term use in any environment

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4" X 18" Or 18" X 4" Heavy Duty Floor Grille Fixed Blades Air Grille Brown [Outer Dimensions: 5.75 X 19.75] 8" Diameter + Product Details Size – Compatible With Duct 7in Applications This sheet metal DDAG A 1212 + Product Details Size – 18"w X 20"h is the size for the duct opening measurement only + Product Details Size 30"w X 8"h Is The Size For The Duct Opening Measurement Only